Method and apparatus for integrating isochronous and asynchronous communication in a network

Abstract

The present invention provides a method and an apparatus for providing a multiple access isochronous network that is capable of accommodating isochronous and asynchronous traffic. In accordance with the present invention, a non-zero thresholding mechanism is utilized at the receivers of the receiver/transmitter pairs communicating over the network to determine whether a given sub-channel is idle, or whether the receive buffer of a receiver operating in the receive mode is to be updated with a binary 0 or a binary 1. Utilizing the non-zero thresholding mechanism allows for the possibility that nothing is being sent over a particular sub-channel during one or more symbol periods. Utilizing the non-zero thresholding mechanism enables asynchronous and isochronous transport to occur on an isochronous framework without the need for stuffing bits onto the channel. Signals received over a sub-channel are demodulated and correlated to generate correlation results. Each correlation result is compared to a non-zero threshold to determine whether sufficient energy exists on the channel to indicate that a bit decision should be made. If insufficient energy exists on the sub-channel to warrant performing a bit decision, then the channel is deemed to be idle and no bit decision is performed. If sufficient energy exists on the sub-channel to warrant performing a bit decision, then the channel is deemed not to be idle and a bit decision is performed.