CARRIER GROUP APPORTIONMENT FOR A SATELLITE COMMUNICATIONS SYSTEM

• US 20100118765A1
• Filed: 11/10/2009
• Published: 05/13/2010
• Est. Priority Date: 11/10/2008
• Status: Active Grant

• Current Assignee: ViaSat Incorporated
• Original Assignee: ViaSat Incorporated
• Inventors: Agarwal, Anil
• Granted Patent: US 8,351,383 B2
• Time in Patent Office: Days
• US Class Current: 370/316
• CPC Class Codes: H04B 7/18539 Arrangements for managing radio, resources, i.e. for establishing or releasing a connection

Abstract

Satellite communications systems, methods, and related devices are described. In one embodiment, a satellite communications system is configured to dynamically allocate bandwidth and frequencies among different beams. Bandwidth request data may be received and compiled from the terminals. The satellite may be configured with different beam coverage areas, and may dynamically allocate bandwidth and particular frequency channels to different beam coverage areas based on the requests. In each of a series of one or more epochs, and according to the bandwidth requests, there may be allocations among carrier groups, traffic classes, and particular terminals. The setup of slot structure and selection of modes for particular terminals is also addressed.

Claims

1. A method for allocating bandwidth resources in a multi-beam satellite communications network having a plurality of terminals in each of a plurality of beams, the bandwidth resources defined in resource units, the method comprising:

receiving a resource request from each of at least a subset of the plurality of terminals in a beam of the plurality of beams, wherein at least a subset of resource requests identify an amount of requested resource units and a requested carrier group for the requesting terminal;

identifying an amount of allocatable resource units for the beam for a defined time duration, the amount of allocatable resource units for the beam determined responsive to the received resource requests for the beam relative to other beams of the plurality of beams; and

allocating the amount of resource units for the beam for the defined time duration among a plurality of carrier groups for the beam to generate a carrier group allocation associated with each of the plurality of carrier groups, the allocating responsive to the requested carrier groups for the at least the subset of the plurality of terminals in the beam.

2. The method of claim 1, wherein the allocating among the plurality of carrier groups comprises:

dynamically changing the carrier group allocation, wherein an amount of requested resource units for one or more carrier groups of the plurality of carrier groups for the defined time duration is different from an amount of requested resource units for the one or more carrier groups of the plurality of carrier groups for a prior time duration, the amount of requested resource units for the prior time duration determined according to prior resource requests.

3. The method of claim 2, wherein the defined time duration is substantially adjacent to the prior time duration.

4. The method of claim 1, wherein the allocating among the plurality of carrier groups comprises:

allocating among each of the carrier groups using a prioritization scheme corresponding to a set of resource obligations.

5. The method of claim 4, wherein the set of resource obligations are specified in the resource requests, and the specified resource obligations include:

a minimum sustained rate for communications from each requesting terminal;

a committed information rate for communications from each requesting terminal; and

a requested information rate for communications from each requesting terminal.

6. The method of claim 5, wherein the set of resource obligations is specified for each of a plurality of traffic classes.

7. The method of claim 1, wherein the allocating among the plurality of carrier groups comprises:

allocating among each of the carrier groups in an order corresponding to a terminal prioritization scheme.

8. The method of claim 1, wherein,

the resource requests identify one or more traffic classes associated with different portions of the amount of requested resource units for each requesting terminal;

each requesting terminal is associated with a priority level; and

the allocation among the plurality of carrier groups is further responsive to the traffic class associations and the terminal priority levels for the resource requests.

9. The method of claim 1, wherein the allocating among the plurality of carrier groups comprises:

allocating to each carrier group of the plurality of carrier groups, a minimum sustained rate resource request specified in the received resource requests for each carrier group;

allocating to each carrier group, after allocating the minimum sustained rate resource request, a committed information rate resource request specified in the received resource requests for each carrier group; and

allocating to each carrier group, after allocating the committed information rate resource requests, a requested information rate resource request specified in the received resource requests for each carrier group.

10. The method of claim 1, wherein the allocating among the plurality of carrier groups comprises, for each of a series of allocation steps:

determining whether a sufficient amount of the allocatable resource units remain to satisfy an allocation associated with the respective allocation step; and

when there is not the sufficient amount of allocatable resource units remaining to satisfy the allocation associated with the allocation step, allocating a remainder of the allocatable resource units among the plurality of carrier groups according to a fairness policy.

11. The method of claim 1, further comprising:

monitoring an amount of data traffic associated with the resource requests; and

changing the defined time duration as the monitored data traffic flow varies.

12. The method of claim 1, further comprising:

generating an amount of requested resource units from the resource requests for the defined time duration, wherein the received resource requests are associated with the defined time duration and different portions of the generated amount are associated with different carrier groups of the plurality of carrier groups.

13. The method of claim 1, wherein the amount of allocatable resource units for the defined time duration is determined based on the amount of requested resource units in the received resource requests for the beam for the time duration relative to other beams of the plurality of beams for the time duration.

14. The method of claim 1, wherein the method is performed by the satellite.

15. The method of claim 1, wherein the method is performed by a network control center, and the bandwidth resource comprises uplink bandwidth resources.

16. A system for allocating bandwidth resources in a beam of a satellite communications network having a plurality of terminals, the bandwidth resources defined in resource units and the beam including a plurality of carrier groups, the system comprising:

a beam request compilation module configured to;

receive one or more resource requests from each of at least a subset of the plurality of terminals in the beam, wherein at least a subset of resource requests identifies an amount of requested resource units and a requested carrier group for the requesting terminal; and

generate an amount of requested resource units from the received resource requests, wherein different portions of the amount are associated with different carrier groups of the plurality of carrier groups;

a beam resource module configured to identify an amount of allocatable resource units for the beam for a defined time duration; and

a carrier group allocation module, communicatively coupled with the beam request compilation module and the beam resource module, and configured to allocate the amount of allocatable resource units for the beam for the defined time duration among the plurality of carrier groups to generate a carrier group allocation associated with each of the plurality of carrier groups, the carrier group allocation responsive to the portions of the amount of requested resource units associated with respective carrier groups of the plurality of carrier groups.

17. The system of claim 16, wherein the carrier group allocation module is configured to:

dynamically change the carrier group allocation, wherein an amount of requested resource units for one or more carrier groups of the plurality of carrier groups for the defined time duration is different from an amount of requested resource units for the one or more carrier groups of the plurality of carrier groups for a prior time duration, the amount of requested resource units for the prior time duration determined according to prior resource requests

18. The system of claim 16, wherein the carrier group allocation module is configured to perform the allocation among the plurality of carrier groups using a prioritization scheme corresponding to a set of resource obligations.

19. The system of claim 18, wherein the set of resource obligations is specified for each of a plurality of traffic classes, and the prioritization scheme specifies that allocating is performed in an order corresponding to traffic class priority.

20. The system of claim 16, wherein,

the resource requests identify one or more traffic classes associated with different portions of the amount of requested resource units for each requesting terminal;

each requesting terminal is associated with a priority level; and

the allocation among the plurality of carrier groups is further responsive to the traffic class associations and the terminal priority levels for the resource requests.

21. The system of claim 16, wherein the carrier group allocation module is configured to perform the allocation among the plurality of carrier groups by:

allocating to each carrier group of the plurality of carrier groups, a minimum sustained rate resource request specified in the received resource requests for each carrier group;

allocating to each carrier group, after allocating the minimum sustained rate resource requests, a committed information rate resource request specified in the received resource requests for each carrier group; and

allocating to each carrier group, after allocating the committed information rate resource requests, a requested information rate resource request specified in the received resource requests for each carrier group.

22. The system of claim 16, further comprising a monitoring module, communicatively coupled with the carrier group allocation module, and configured to:

monitor a variance in an amount of data traffic associated with the resource requests for the beam for each of the plurality of carrier groups for each of a series of time durations; and

change a length of the defined time duration change when the variance exceeds a threshold.

23. The system of claim 16, wherein the system comprises the satellite, a gateway, or any combination thereof.

24. A system for allocating bandwidth resources in a multi-beam satellite communications network having a plurality of terminals in each of a plurality of beams, the bandwidth resources defined in resource units, the system comprising:

the plurality of terminals in a beam of the plurality of beams, wherein at least a subset of the plurality of terminals in the beam are each configured to transmit a resource request identifying an amount of requested resource units and a requested carrier group for the requesting terminal;

a network control center in communication with the at least a subset of the terminals via satellite, and configured to;

receive the resource requests;

generate, for a defined time duration, an amount of requested resource units for respective carrier groups of a plurality of carrier groups for the beam from the received resource requests;

identify an amount of allocatable resource units for the beam for the defined time duration; and

allocate the amount of resource units for the beam for the defined time duration among a plurality of carrier groups to generate a carrier group allocation associated with each of the plurality of carrier groups, the allocation responsive to the amount of requested resource units for respective carrier groups for the defined time duration.

25. The system of claim 24, wherein,

the network control center comprises a plurality of devices;

the bandwidth resources comprise bandwidth resources on the satellite uplink for the beam; and

the resource requests comprise resource requests for the plurality of terminal within the beam on the satellite uplink.

26. A device for allocating bandwidth resources in a satellite communications network having a plurality of terminals in a beam of the satellite, the bandwidth resources defined in resource units, the device comprising:

means for receiving resource requests from each of at least a subset of the plurality of terminals in the beam, wherein at least a subset of resource requests identifies an amount of requested resource units and a requested carrier group for the requesting terminal;

means for generating, for a defined time duration, an amount of requested resource units for respective carrier groups of a plurality of carrier groups for the beam from the received resource requests;

means for identifying an amount of resource units for the beam for the defined time duration; and

means for allocating the amount of resource units for the beam for the defined time duration among the plurality of carrier groups to generate a carrier group allocation associated with each of the plurality of carrier groups, the allocating responsive to the amount of requested resource units for respective carrier groups.