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 ATDM-MA protocol.,br>
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.

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