Broadband satellite system and method

• US 8,320,299 B2
• Filed: 09/02/2008
• Issued: 11/27/2012
• Est. Priority Date: 09/05/2007
• Status: Active Grant

• Current Assignee: Comtech Satellite Network Technologies, Inc. (Comtech Telecommunications Corporation)
• Original Assignee: Comtech EF Data (Comtech Telecommunications Corporation)
• Inventors: Ehlers, John, Eymann, Steven, Reum, Phil
• Primary Examiner(s): Nooristany, Sulaiman
• Application Number:
  US12/202,505
• Publication Number:
  US 20090059839A1
• Time in Patent Office: 1,547 Days
• Field of Search: 370/321
• US Class Current: 370/321
• CPC Class Codes: H04B 7/18582 Arrangements for data linking, i.e. for data framing, for error recovery, for multiple access

Abstract

Implementations of broadband satellite systems may comprise systems implementing embodiments of one, two or all of the aspects of distributed leadership, distributed bandwidth allocation and distributed timing. In systems implementing distributed leadership aspects, the control and administration of the network can be effectively performed by any site. In systems implementing distributed bandwidth allocation aspects, all remote sites may act in concert by running the same algorithm on the information they have received, arriving at a harmonious conclusion. In systems implementing distributed timing aspects, time division multiple access (“TMDA”) bursts within timeslots may not require a central timing reference, a distributed high stability timing reference or a timing leader.

Claims

1. A method of establishing distributed leadership for a satellite communication network, the method comprising:

assigning a unique identifier to each of a plurality of remote sites in a communication network, each remote site configured for communication with at least one satellite;

storing one or more bandwidth allocation parameters associated with each of the plurality of remote sites in memory at each of the plurality of remote sites, the one or more bandwidth allocation parameters comprising at least one of a dedicated information rate, a committed information rate, and a maximum information rate;

wherein for each of the plurality of remote sites the method further comprising;

automatically searching for a communication network to join when the remote site is not actively participating in any communication network;

if the remote site finds a communication network to join, downloading a network table from a current network leader of the communication network identifying all of the remote sites of the plurality of remote sites expected to participate in the communication network and determining whether the remote site is to assume leadership of the communication network and assuming leadership if the unique identifier for the remote site is lower in a leadership hierarchy than the unique identifier for all other remote sites participating in the communication network; and

automatically assuming leadership to form a new communication network if the remote site cannot find any communication network to join.

2. The method of claim 1, wherein for each of the plurality of remote sites the method further comprising:

tuning a receiver associated with the remote site to a predefined frequency to determine whether any communication network exists to join when the remote site is not actively participating in any communication network.

3. The method of claim 2, wherein for each of the plurality of remote sites the method further comprising:

waiting until the remote site is asked to join the existing communication network before enabling a transmitter associated with the remote site.

4. The method of claim 3, wherein for each of the plurality of remote sites the method further comprising responding to the invitation to join after the transmitter is enabled.

5. The method of claim 1, wherein for each of the plurality of remote sites, if the remote site assumes leadership of the new communication network, the method further comprising:

identifying or loading a valid network table at the remote site;

determining whether other remote sites of the plurality of remote sites are included in the valid network table that are not currently participating in the network; and

submitting to the other remote sites not currently participating an invitation to join the new communication network.

6. The method of claim 5, wherein for each of the plurality of remote sites, if any of the other remote sites not currently participating joins the new communication network, the method further comprising:

determining at the remote site whether to remain as the current network leader or relinquish leadership to one of the other remote sites of the plurality of remote sites.

7. A method of establishing distributed leadership for a satellite communication network, the method comprising:

assigning a unique identifier to each of a plurality of remote sites in a communication network, each remote site configured for communication with at least one satellite;

storing one or more bandwidth allocation parameters associated with each of the plurality of remote sites in memory at each of the plurality of remote sites, the one or more bandwidth allocation parameters comprising at least one of a dedicated information rate, a committed information rate, and a maximum information rate, and storing a network table by downloading from a current network leader of the communication network that identifies all of the remote sites expected to participate in the communication network;

establishing a first remote site of the plurality of remote sites as the current network leader of the communication network, wherein each remote site is configured to assume leadership of the communication network when the leadership parameters indicate any of the remote sites is to become the current network leader;

reestablishing which of the plurality of remote sites is the current leader when any remote site joins the communication network by each remote site of the plurality of remote sites assuming leadership and becoming the current network leader of the communication network if the unique identifier for the remote site is lower in a leadership hierarchy than the unique identifier for all other remote sites participating in the communication network; and

wherein each remote site monitoring communication from each of the other remote sites expected to participate in the communication network to determine when any of the plurality of remote sites stops participating in the communication network.

8. The method of claim 7, wherein if one of the plurality of the other remote sites expected to participate in the communication network stops participating, the method further comprising:

determining whether the current leader is the remote site that stopped participating and if so, re-establishing a new current leader selected from among the remaining remote sites of the plurality of remote sites.

9. The method of claim 8, further comprising the new current leader inviting the current leader that stopped participating in the network to rejoin the network.

10. The method of claim 7, wherein if one of the plurality of the other remote sites expected to participate in the communication network stops participating, the method further comprising the current leader inviting the remote site that stopped participating in the communication network to rejoin the network.

11. The method of claim 10, wherein when the remote site rejoins the communication network, the method further comprising:

determining which remote site of the plurality of remote sites is to be the current leader pursuant to the leadership criteria and changing the current leader to the remote site that meets the leadership criteria.

12. A satellite communication network comprising:

at least one communication satellite orbiting an Earth;

a plurality of remote sites on the Earth as part of a communication network,

wherein each of the remote sites comprises;

a unique identifier associated with the remote site;

memory configured to store one or more bandwidth allocation parameters associated with the remote site and a network table that identifies all other remote sites expected to participate in the communication network, the one or more bandwidth allocation parameters comprising at least one of a dedicated information rate, a committed information rate, and a maximum information rate;

operational parameters stored at the remote site including parameters by which the remote site is configured to automatically search for the communication network to join when the remote site is not actively participating in any communication network, join an existing communication network, download the network table from a current network leader of the communication network, configure each remote site to assume leadership of the existing communication network if the unique identifier for the remote site is lower in a leadership hierarchy than the unique identifier for all other remote sites participating in the existing communication network when the remote site joins the existing communication network; and

if the remote site cannot find any communication network to join, the remote site automatically assume leadership to form a new communication network by which the remote site is configured to establish the new communication network as the current network leader.

13. The satellite communication network of claim 12, wherein the bandwidth allocation parameters comprise at least one of a dedicated information rate, a committed information rate and a maximum information rate.

14. The satellite communication network of claim 12, wherein the operational parameters stored at the remote site further configure each remote site to monitor communication from each of the other remote sites of the plurality of remote sites to determine when any of the plurality of remote sites stops participating in the communication network.

15. The method of claim 14, wherein the operational parameters stored at the remote site further configure each remote site to determine whether the current leader is the remote site that stopped participating and if so, re-establish a new current leader selected from among the remaining remote sites of the plurality of remote sites.