Forward link power control

• US 10,587,333 B2
• Filed: 12/13/2017
• Issued: 03/10/2020
• Est. Priority Date: 12/13/2016
• Status: Active Grant

• Current Assignee: Inmarsat Global Limited (Inmarsat PLC)
• Original Assignee: Inmarsat Global Limited (Inmarsat PLC)
• Inventors: Bhave, Paven, Sharkey, Patrick, Bath, David, Locke, Richard
• Primary Examiner(s): Hailu, Kibrom T
• Application Number:
  US15/840,400
• Publication Number:
  US 20180167135A1
• Time in Patent Office: 818 Days
• CPC Class Codes: H04B 7/18513 Transmission in a satellite or space-based system
• CPC Class Codes: H04B 7/18519 Operations control, administration or maintenance
• CPC Class Codes: H04B 7/18543 for adaptation of transmission parameters, e.g. power control for detecting or preventing errors in the information received H04L1/00
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0015 characterised by the adaptation strategy
• CPC Class Codes: H04W 52/18 TPC being performed according to specific parameters
• CPC Class Codes: H04W 52/346 distributing total power among users or channels
• CPC Class Codes: H04W 52/42 in systems with time, space, frequency or polarisation diversity

Abstract

A method of forward link power control in a communications system comprises: grouping a plurality of user terminals into a plurality of groups, at least one of which comprises more than one of the user terminals; for each said group, determining a corresponding forward link power level required to satisfy an aggregate demand of the group; and assigning one or more forward link carriers to the group, with the corresponding power level.

Claims

1. A method of forward link power control in a wireless communication system, the method comprising:

a. for each of a plurality of user terminals, determining a respective forward link demand of that user terminal;

b. grouping the plurality of user terminals into a plurality of groups according to said determined forward link demands of each of the user terminals, wherein at least one of the groups comprises more than one of the user terminals;

c. for each said group, determining a corresponding forward link power level required to satisfy an aggregate of said determined forward link demands of each of the user terminals within that group, and assigning one or more forward link carriers to the group, with the corresponding forward link power level.

2. The method of claim 1, wherein grouping the user terminals includes sorting the user terminals by said determined forward link demands of each of the user terminals and segregating the user terminals into the plurality of groups.

3. The method of claim 1, wherein said forward link demands are determined from corresponding forward data queue lengths for each of said terminals.

4. The method of claim 1, wherein said forward link demands are determined from corresponding demand requirements received from each of the user terminals.

5. The method of claim 1, wherein at least one of the groups comprises a single said user terminal having a higher determined forward link demand than other ones of the user terminals.

6. The method claim 1, wherein the user terminals are additionally grouped by geographic location.

7. The method of claim 1, wherein the wireless communication system is a satellite communications system.

8. The method of claim 7, wherein the user terminals are arranged in a plurality of beams in which the carriers may be re-used subject to a minimum re-use distance.

9. The method of claim 1, wherein the number of groups is limited to a predetermined maximum.

10. The method of claim 1, wherein the forward link power levels are constrained by a maximum aggregate power level.

11. The method of claim 1, wherein the power level comprises an EIRP.

12. The method of claim 1, wherein the carriers comprise frequency channels.

13. The method of claim 1, including assigning a corresponding coding and/or modulation rate to each of the forward link carriers.

14. The method of claim 1, including transmitting to the user terminals using the forward link carriers with the corresponding power levels.

15. The method of claim 1, wherein each said group is assigned to a corresponding one of the forward link carriers.

16. The method of claim 8, wherein a plurality of said groups of user terminals are located within the same one of said beams.

17. A wireless communication system comprising:

a plurality of user terminals; and

a transmitter arranged to transmit wireless signals to the plurality of user terminals over a forward link;

wherein a respective forward link demand is determined for each of the user terminals, and the user terminals are grouped into a plurality of groups according to said determined forward link demands of each of the user terminals, wherein at least one of the groups comprises more than one of the user terminals;

for each said group, a corresponding forward link power level required to satisfy an aggregate of said determined forward link demands of each of the user terminals within that group is determined, and one or more forward link carriers are assigned to the group, with the corresponding forward link power level.

18. A non-transient computer readable medium containing program instructions for causing a computer to:

a. for each of a plurality of user terminals, determine a forward link demand of that user terminal;

b. group the plurality of wireless user terminals into a plurality of groups according to said determined forward link demands of each of the user terminals, wherein at least one of the groups comprises more than one of the user terminals;

c. for each said group, determine a corresponding forward link power level required to satisfy an aggregate of said determined forward link demands of each of the user terminals within that group, and assign one or more forward link carriers to the group, with the corresponding forward link power level.