Satellite telecommunications system featuring multi-beam coverage and dynamically controlled allocation of the satellite transmission capacity

• US 4,722,083 A
• Filed: 11/04/1985
• Issued: 01/26/1988
• Est. Priority Date: 11/02/1984
• Status: Expired due to Fees

• Current Assignee: Consiglio Nazionale Delle Ricerche (Repubblica Italiana)
• Original Assignee: Consiglio Nazionale Delle Ricerche (Repubblica Italiana)
• Inventors: Tirro, Sabastiano, Patacchini, Arduino
• Primary Examiner(s): Griffin, Robert L.
• Assistant Examiner(s): Chin, Stephen
• Application Number:
  US06/794,650
• Time in Patent Office: 813 Days
• Field of Search: 370/80, 370/93, 370/94, 370/95, 370/104, 455/12
• US Class Current: 370/323
• CPC Class Codes: H04B 7/2045 SS-FDMA, FDMA satellite switching

Abstract

The invention relates to a satellite telecommunications system featuring multi-beam coverage and dynamically controlled allocation of the satellite transmission capacity, of the type where a number of earth stations are linked to a satellite on board which regeneration of the earth-to-satellite signal is brought about. The system also features a modular beam-switching pattern and utilizes asynchronous protocol procedures for the exchanges between earth traffic stations and master station relative to telephone conversations and videoconferences, and for remote control of an on-board switching matrix (2) which operates the system, that is, allocates the satellite'"'"'s transmission capacity so as to serve all the earth stations.

Claims

1. A micro-processor controlled satellite telecommunications system featuring multi-beam coverage and dynamically controlled allocation of satellite transmission capacity, wherein a number of earth stations are linked by a modular beam switching pattern to a satellite which provides on board regeneration of the earth-to-satellite signal, said system comprising

at least one satellite and a plurality of earth stations each comprising a sending and receiving station, one each of said sending and receiving stations being at least a digital speech interpolation station.

asynchronous type protocol procedures adopted for allocation of the satellite transmission capacity between the various earth stations,

a master station,

signal bursts exchanged between earth traffic stations and with said master station according to said asynchronous protocols, wherein recognition and recovery of bursts transmitted by a given digital speech interpolation station can be achieved by the digital speech interpolation receiving station with control retained by the same transmitting station, according to a remote control signal in the form of a preamble attached to each said burst, and

an on-board switching matrix remotely controlled according to said bursts and preambles, with reference to said asynchronous protocols, and which in turn controls the overall system

2. System as in claim 1 wherein remote control of the on-board switching matrix (2) is implemented by a number of memories controlled by a microprocessor (1), adopting an appropriate protocol procedure.

3. System as in claim 1 wherein conversation between the master station and traffic stations is handled by the distribution of appropriate maps through a signaling channel, for which purpose a further a synchronous protocol procedure is adopted.

4. A system according to claim 1 wherein said on board switching matrix comprises

a control microprocessor adapted to receive and handle said bursts and preambles,

a program memory governing the operation of said control microprocessor,

a deferred instruction memory interconnected with said microprocessor, the program and deferred instruction memories operating in concert with said microprocessor,

a provisional priority data table connected to said microprocessor,

a definitive priority data table connected to said microprocessor and selectively receiving data from said provisional priority data table via said microprocessor,

an operative memory connected to said microprocessor and storing the time cycle to be implemented by said matrix,

a standby memory connected to said microprocessor and storing modification of the time cycle stored in the operative memory, and

a monitor means connected to said microprocessor and said operating and standby memories, said monitor means being adapted to provide an exchange between the operating and standby memories and the microprocessor.

5. A system according to claim 1 wherein two asynchronous protocols are provided for digital speech interpolation traffic and the total number of asynchronous protocols corresponds to the number of different types of signal traffic.

6. A system according to claim 1 wherein transmission information is supplied by the master station and reception information is supplied by each transmitting station, and wherein each preamble attached to each burst is generated in a manner which identifies a corresponding transmitting station.

7. A system according to claim 1 wherein the satellite provides a tandem transmission channel having a signal structure adapted to selectively reject messages, said tandem channel carrying an allocation message along one channel and a routing message along another channel, the routing message permitting delivery of bursts to an appropriate receiving station in the identical state said bursts were emitted from the transmitting station.

8. A system according to claim 1 wherein said bursts are in the form of bricks selected from the group consisting of 4 channels at 32 Kbps and 1 channel at 32 Kbps, not including the preamble.