Browse Prior Art Database

Access to High-Speed LAN via Wireless Media

IP.com Disclosure Number: IPCOM000104312D
Original Publication Date: 1993-Apr-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 4 page(s) / 149K

Publishing Venue

IBM

Related People

Nguyen, TM: AUTHOR [+5]

Abstract

Disclosed is a digital communication system architecture that use point-to-point wireless connection to attach a station to a high speed LAN (e.g., FDDI-I and FDDI-II), in which the wireless connection may have lower bandwidth than that of the LAN. This wireless station-to-LAN connection can support asynchronous, synchronous, and isochronous traffic (synchronous and isochronous traffic support is needed for multimedia and other real-time applications.) A shared buffering scheme is used to distribute the traffic of the high speed LAN onto the slower wireless connections. The following description of the wireless concentrator uses FDDI as an example to describe the wireless concentrators. The wireless concentrator is well suited for other networks (e.g., token ring) as well.

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

Access to High-Speed LAN via Wireless Media

      Disclosed is a digital communication system architecture that
use point-to-point wireless connection to attach a station to a high
speed LAN (e.g., FDDI-I and FDDI-II), in which the wireless
connection may have lower bandwidth than that of the LAN.  This
wireless station-to-LAN connection can support asynchronous,
synchronous, and isochronous traffic (synchronous and isochronous
traffic support is needed for multimedia and other real-time
applications.)  A shared buffering scheme is used to distribute the
traffic of the high speed LAN onto the slower wireless connections.
The following description of the wireless concentrator uses FDDI as
an example to describe the wireless concentrators.  The wireless
concentrator is well suited for other networks (e.g., token ring) as
well.  This concentrator may be used to simplify wiring requirements
within a building.  It provides means to attach movable computer
systems to the existing LANs via a wireless connections.

      Proposed is an efficient architecture which uses point-to-point
wireless LAN connections between a wireless concentrator and a host.
The wireless concentrator does not require that the wireless
connection have same bandwidth as FDDI nor that it meet the bit error
rate requirements of FDDI.  This wireless concentrator can be used
for both FDDI-I and FDDI-II (referred to by the common name FDDI in
this) by supporting asynchronous, synchronous and isochronous
traffic.

      The key components of this wireless concentrator are: (A)
placement of the FDDI MAC in a concentrator (conventionally, it is
placed in the host), (B) wireless connection between the MAC and the

LLC layer and (C) temporary storage buffers (A_BUF, S_BUF, and I_BUF)
and buffer management as shown in  Fig. 1.

      The storage buffers are divided into three groups: (1)
Asynchronous, (2) Synchronous, and (3) Isochronous buffers.  The
separate buffers are used to store each type of traffic that may be
present in the network (e.g., A-BUF, S-BUF and I-BUF for
asynchronous, synchronous and isochronous traffic, respectively, in
Fig. 1).  These buffers are maintained for both the incoming and out
going traffic from FDDI.

      Receive and Transmit Operations - The data received from FDDI
is first processed by the H-MUX which separates isochronous traffic
from packet data.  The isochronous traffic is delivered to the
isochronous buffers via the I-MAC as shown in Fig. 1.  The
asynchronous and synchronous packets are routed to the P-MAC.  The
P-MUX separates synchronous and asynchronous packets and stores them
in  the  A-BUF or the S-BUF, respectively.  Packets from the P-MAC
are separated by the P-MUX using the packet type field in the packet
and are placed in A-BUF and S-BUF.

      The W_MUX multiplexes the outgoing data from all the buffers as
described b...