ENHANCED WIRELESS PACKET DATA COMMUNICATION SYSTEM, METHOD, AND APPARATUS APLLICABLE TO BOTH WIDE AREA NETWORKS AND LOCAL AREA NETWORKS

摘要

A cellular wireless packet data communication system containing transmit-only
endpoint
device (HA40, HA50) which transmit to receive-only base stations (B1, B2, BN).
The system
is configured to allow for large area coverage (e.g., a metropolitan area)
with far fewer number
base stations than are required with conventional two-way cellular systems.
The base station
coverage areas are configured to overlap, allowing for reception of packets at
multiple base
stations. A data concentrator (HA60) resolves redundantly received messages.
The network is
configurable as a WAN, a LAN, or a combination of the two. Novel modulation
techniques
(e.g., a 16QAM submodulation together with a 7FSK modulation) are used such
that low cost
components can be used in the transmitters and receivers while achieving
outstanding
probability of success performance. The endpoint devices are battery operated
and
accordingly, are designed for low power consumption and multi-year battery
life. The system
is used in a variety of applications including remote monitoring and mobile
communications.