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Asynchronous Time Division Multiplexing - an explanation
Multiplexing technique in which transmission capability is organized in unassigned time
slots that are assigned to cells upon request of each application's instantaneous real
need.Asynchronous Time Division Multiplexing - Multiple Access (ATDMMA)
protocol is designed to support different types of service on future wireless indoor local area
networks. The proposed architecture does not follow the conventional cellular or ad-hoc approaches but
still supports both peer-to-peer communication and infrastructure access. It is assumed that a high bit rate
(20Mbits/s) radio solution is used to provide the physical connectivity with omni-directional antennae.
The goal of the ATDM-MA protocol is to provide efficient channel utilisation and re-use and operates in
conjunction with different Medium Access Control (MAC) protocols for different traffic types (i.e. polling
and random access). The throughput and delay of the proposed scheme obtained from computer
simulation shows that good performance can be achieved with modest complexity.
The use of antenna arrays is only practical
in the base stations of cellular based wireless
networks operating in the frequency bands up to an
including 5GHz. At these frequencies the antenna
structures are large, cumbersome and expensive
and can not be placed on mobile nodes. Omnidirectional
antennae are to be used with this new
Future indoor wireless networks will need to be
flexible enough to support applications of different
characteristics and data rates, and allow both peerto-
peer (ad-hoc) communication and infrastructure
access. Peer-to-peer communication is required for
efficient provision of short range services (such as
between portable computing platforms and other
computing platforms or peripheral devices).
Infrastructure access is required for retrieval or
conversational services between a node and a
server or another node in an external network.