초록 ▼

Time Division Multiple Access (TDMA) is being utilized widely in domestic and international communication networks. The types of TDMA networks in operation fall into two categories: Wideband and Narrowband. In the past few years, a number of Wideband and Narrowband TDMA networks have gone into opera

Time Division Multiple Access (TDMA) is being utilized widely in domestic and international communication networks. The types of TDMA networks in operation fall into two categories: Wideband and Narrowband. In the past few years, a number of Wideband and Narrowband TDMA networks have gone into operation. However, these networks have typically operated as independent nets. As the existing Wideband TDMA networks expand into cities with a smaller amount of originating traffic, a major economic problem occurs. It becomes difficult to justify the cost of a Wideband TDMA station for the smaller amount of traffic. This invention presents an approach that solves the above problem by providing an integrated network with Wideband TDMA for the large cities and Narrowband TDMA for the smaller cities.

대표청구항 ▼

A communication system including a quasi-stationary earth orbiting transponder and at least two groups of earth stations communicating through said transponder comprising; a first group of stations communicating with each other in a TDMA format through said transponder at a first bit rate, and at a

A communication system including a quasi-stationary earth orbiting transponder and at least two groups of earth stations communicating through said transponder comprising; a first group of stations communicating with each other in a TDMA format through said transponder at a first bit rate, and at a common carrier frequency, one of said first group stations including means for transmitting at least a single reference burst per frame at a second bit rate, lower than said first bit rate, a second group of stations communicating with each other and with first group stations in a FDMA/TDMA format through said transponder at said second bit rate, and means for allocating frame capacity by uniquely assigning burst times to stations transmitting at said first bit rate and providing multiple simultaneous burst assignments to stations transmitting at said second bit rate, whereby full connectivity throughout all said stations is maintained and efficiency loss is minimized through the multiple simultaneous transmissions from second group stations at said second bit rate.