Methods of dynamically switching return channel transmissions of time-division multiple-access (TDMA) communication systems between signalling burst transmissions and message transmissions

• US 6,301,232 B1
• Filed: 01/20/1999
• Issued: 10/09/2001
• Est. Priority Date: 09/30/1996
• Status: Expired due to Term

• Current Assignee: ATC Technology Corporation (FedEx Corporation)
• Original Assignee: Motient Services, Inc.
• Inventors: Dutta, Santanu
• Primary Examiner(s): HSU, ALPUS
• Application Number:
  US09/233,179
• Time in Patent Office: 993 Days
• Field of Search: 370/280, 370/328, 370/329, 370/335, 370/337, 370/342, 370/347, 370/316, 370/319, 370/321, 455/450, 455/451, 455/452, 455/453, 455/422, 455/427, 455/428, 455/12.1, 455/13.1
• US Class Current: 370/321
• CPC Class Codes: H04B 7/18513 Transmission in a satellite or space-based system

Abstract

A method configures at least one channel group of a communication system. The channel group includes at least one forward channel and at least one return channel. A central station transmits data over the forward channel to a plurality of terminals, and transmissions by each terminal to the central station occur on a return channel. The method configures at least one channel group to include each forward channel and a selected number of return channels, which configuration is responsive to message traffic projections of each return channel. The selected number of return channels is generally limited to a maximum number of return channels when capacity of each forward channel of the channel group becomes exhausted.

Claims

1. A method of configuring at least one channel group of a communication system, the at least one channel group having at least one forward channel and at least one return channel, wherein a central station transmits data over said at least one forward channel of the at least one channel group to a plurality of terminals, and transmissions by any of the plurality of terminals to the central station are performed on any one of the at least one return channel of the at least one channel group, the method comprising the steps of:

configuring the at least one channel group to include the at least one forward channel and a predetermined number of the at least one return channel responsive to message traffic projections over at least one return channel link; and

configuring the at least one channel group to include the at least one forward channel and the predetermined number of the at least one return channel, which is responsive to the message traffic projections over the at least one return channel link, and the step of reaching an upper limit for adding more return channels in addition to the predetermined number of the at least one return channel to the at least one channel group when capacity of the at least one forward channel of the at least one channel group becomes exhausted.

2. The method according to claim 1, wherein said configuring step further comprises the step of configuring the at least one channel group to include the at least one forward channel and the selected number of the at least one return channel responsive to the message traffic projections over the at least one return channel link having an arbitrarily selected function of one of a signaling channel and a messaging channel.

3. The method according to claim 1, further comprising the step of transmitting the message over the at least one return channel slotted in accordance with a mixed sequence of signaling and messaging transmissions.

4. The method according to claim 1, wherein said configuring step further comprises the step of configuring the at least one channel group to include the at least one forward channel and the selected number of the at least one return channel responsive to the message traffic projections over the at least one return channel link and the at least one forward channel operating with the at least one return channel to substantially represent a bidirectional channel group of the communication system, providing signaling functions and data service with automatic repeat requests over the at least one return channel.

5. A method of configuring at least one channel group of a mobile satellite communication system, the at least one channel group having at least one forward channel and at least one return channel, wherein a central station transmits data over said at least one forward channel of the at least one channel group to a plurality of terminals, and transmissions by any of the plurality of terminals to the central station are made on any one of the at least one return channel of the at least one channel group, the method comprising the steps of:

configuring the at least one channel group to include the at least one forward channel and a selected number of the at least one return channel responsive to message traffic projections over the at least one return channel link; and

configuring the at least one channel group to include the at least one forward channel and the selected number of the at least one return channel responsive to the message traffic projections over the at least one return channel link, and reaching an upper limit for adding more return channels in addition to the selected number of the at least one return channel to the at least one channel group when capacity of the at least one forward channel of the at least one channel group becomes exhausted.

6. The method according to claim 5, wherein said configuring step further comprises the step of configuring the at least one channel group to include the at least one forward channel and the selected number of the at least one return channel responsive to the message traffic projections over the at least one return channel link having an arbitrarily selected function of one of a signaling channel and a messaging channel.

7. The method according to claim 5, further comprising the step of transmitting the message over the at least one return channel slotted in accordance with a mixed sequence of signaling and messaging transmissions.

8. The method according to claim 5, wherein said configuring step further comprises the step of configuring the at least one channel group to include the at least one forward channel and the selected number of the at least one return channel responsive to the message traffic projections over the at least one return channel link and the at least one forward channel operating with the at least one return channel to substantially represent a bidirectional channel group of the mobile satellite communication system, providing signaling functions and data service with automatic repeat requests over the at least one return channel.

9. A mobile satellite communication system, including a central station and a plurality of terminals communicating over at least one channel group having at least one forward channel and at least one return channel, wherein the central station transmits data over said at least one forward channel of the at least one channel group to the plurality of terminals, and transmissions by any of the plurality of terminals to the central station are made on any one of the at least one return channel of the at least one channel group, wherein the at least one channel group is configured to include the at least one forward channel and a selected number of the at least one return channel responsive to message traffic projections over the at least one return channel link;

and

wherein an upper limit for adding more return channels in addition to the selected number of the at least one return channel to the at least one channel group is reached when capacity of the at least one forward channel of the at least one channel group becomes exhausted.

10. The mobile satellite communication system according to claim 9, wherein the at least one channel group comprises an arbitrarily selected function of one of a signaling channel and a messaging channel.

11. The mobile satellite communication system according to claim 9, wherein the message is transmitted over the at least one return channel slotted in accordance with a mixed sequence of signaling and messaging transmissions.

12. The mobile satellite communication system according to claim 9, wherein the at least one forward channel operates in combination with the at least one return channel to substantially represent a bidirectional channel group of the mobile satellite communication system, providing signaling functions and data service with automatic repeat requests over the at least one return channel.