Abstract: In a UPnP network, a system and method have been provided for multicasting a byebye message by proxy. The method comprises: maintaining a list of available networked devices; maintaining a record of advertised UPnP elements; comparing the list of available networked devices to the record of advertised UPnP elements; and, multicasting a byebye message by proxy, for advertised UPnP elements associated with networked devices that are no longer available. The comparison of the list of available networked devices to the record of UPnP elements includes determining advertised UPnP elements in the record that cannot be cross-referenced to available networked devices. The method further comprises removing UPnP elements from the record in response to the comparison.

Abstract: A system and method are provided for reestablishing communication periods in a rendezvous scheduled communication system. The method comprises: establishing a plurality of time points (TPs); initiating a new communication period at a TP; terminating the new communication period and, then, resuming a previously established communication period. The new communication period may be terminated because a link cannot be established or alternately, the new communication period ends before the occurrence of the next TP because there is no further information to exchange. The system and method effectively extends the duration of communication periods for communication links where information exchange is required. It does this by allowing unused portions of communication periods for other communication links to be used on links where information exchanged is desired.

Abstract: A system and method are provided for reestablishing communication periods in a rendezvous scheduled communication system. The method comprises: establishing a plurality of time points (TPs); initiating a new communication period at a TP; terminating the new communication period and, then, resuming a previously established communication period. The new communication period may be terminated because a link cannot be established or alternately, the new communication period ends before the occurrence of the next TP because there is no further information to exchange. The system and method effectively extends the duration of communication periods for communication links where information exchange is required. It does this by allowing unused portions of communication periods for other communication links to be used on links where information exchanged is desired.

Abstract: A system is provided to time the periods of known inactivity in a synchronous communications system in such a manner as to allow the high speed oscillator, used in the various timing, modulation, and demodulation operations of a portable communications unit, to be shut off without a significant loss in timing resolution. A low power, low speed, oscillator is used to measure a majority of the inactive period to save battery power. The low speed oscillator has a frequency too slow to provide the resolution necessary for accurate timing. However, a small portion of the inactive period is timed with the high frequency oscillator. The fine resolution of the time segment measured by the high speed oscillator, when combined with segment of time measured by the low speed oscillator, yields a measurement of the inactive period that is approximately the same as obtained when just the high speed oscillator is used.