Methods of providing power headroom reports arranged in order of component carrier indices and related wireless terminals and base stations

• US 9,622,198 B2
• Filed: 11/19/2015
• Issued: 04/11/2017
• Est. Priority Date: 06/18/2010
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Bostrm, Lisa, Baldemair, Robert, Gerstenberger, Dirk, Larsson, Daniel, Wiemann, Henning
• Primary Examiner(s): Crutchfield, Christopher
• Assistant Examiner(s): PHAM, TITO Q
• Application Number:
  US14/946,263
• Publication Number:
  US 20160081045A1
• Time in Patent Office: 509 Days
• Field of Search: None
• CPC Class Codes: H04W 52/30 using constraints in the total amount of available transmission power
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
• CPC Class Codes: H04W 52/346 distributing total power among users or channels
• CPC Class Codes: H04W 52/365 Power headroom reporting
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/54 Signalisation aspects of the TPC commands, e.g. frame structure
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network

Abstract

Power headroom reports may be transmitted from a wireless terminal to a base station wherein a primary component carrier and at least one secondary component carrier are provided for uplink transmissions from the wireless terminal to the base station and wherein a respective component carrier index is assigned to each of the at least one secondary component carriers provided for the wireless terminal. Respective power headroom reports may be generated for the primary component carrier and for each of the at least one secondary component carriers, and a MAC control element may be generated including the power headroom reports for the primary and secondary component carriers. More particularly, the power headroom reports for each of the at least one secondary component carriers may be arranged in order of the component carrier indices for the respective secondary component carriers. The MAC control element including the power headroom reports for the primary and secondary component carriers may be transmitted from the wireless terminal to the base station over one of the component carriers. Related wireless terminals, and base stations are also discussed.

Claims

1. A method of transmitting power headroom reports from a wireless terminal to a base station, wherein a primary component carrier and at least two secondary component carriers are provided for uplink transmissions from the wireless terminal to the base station, wherein the at least two secondary component carriers include first and second secondary component carriers, wherein a respective component carrier index is assigned to each of the at least two secondary component carriers provided for the wireless terminal, the method comprising:

generating respective power headroom reports for the primary component carrier and for each of the at least two secondary component carriers;

generating a MAC control element including the power headroom reports for the primary component carrier and for each of the at least two secondary component carriers including the first and second secondary component carriers, wherein the power headroom reports for each of the at least two secondary component carriers are arranged in order of the component carrier indices for the respective secondary component carriers, wherein the power headroom report for the primary component carrier is included in an 8 bit primary component carrier octet of the MAC control element, wherein the power headroom report for the first secondary component carrier is included in an 8 bit first secondary component carrier octet of the MAC control element, wherein the power headroom report for the second secondary component carrier is included in an 8 bit second secondary component carrier octet of the MAC control element, and wherein no specific component carrier identifier and no component carrier index is included in the 8 bit primary component carrier octet, in the 8 bit first secondary component carrier octet, and in the 8 bit second secondary component carrier octet; and

transmitting the MAC control element including the power headroom reports for the primary and secondary component carriers from the wireless terminal to the base station over one of the component carriers.

2. A method according to claim 1 wherein the power headroom report for the primary component carrier precedes the power headroom reports for each of the at least two secondary component carriers in the MAC control element, and wherein the power headroom reports for each of the at least two secondary component carriers are arranged in ascending order of the respective component carrier indices.

3. A method according to claim 1 wherein the power headroom report for each of the primary and secondary component carriers includes a Type 1 power headroom level for a physical uplink shared channel of the respective component carrier.

4. A method according to claim 3, wherein the power headroom report for the primary component carrier is a first power headroom report for the primary component carrier, and wherein the MAC control element includes a second power headroom report for the primary component carrier including a Type 2 power headroom level of the primary component carrier.

5. A method according to claim 1 wherein each of the at least two secondary component carriers are configured and/or activated for uplink transmissions from the wireless terminal to the base station.

6. A method according to claim 1, wherein the power headroom report for the primary component carrier is a first power headroom report for the primary component carrier including a Type 1 power headroom level for the primary component carrier, wherein the MAC control element includes a second power headroom report for the primary component carrier including a Type 2 power headroom level for the primary component carrier, wherein the second power headroom report for the primary component carrier is included in an 8 bit second primary component carrier octet, wherein the second power headroom report for the primary component carrier precedes the first power headroom report for the primary component carrier in the MAC control element, wherein the power headroom reports for the first and second secondary component carriers include respective Type 1 power headroom levels, and wherein the power headroom reports for the at least two secondary component carriers follow the first and second power headroom reports for the primary component carrier.

7. The method of claim 6, wherein the MAC control element includes an 8 bit header octet including a Logical Channel Identification (LCID) identifying the MAC control element as providing power headroom reports, wherein the first and second power headroom reports for the primary component carrier follow the header octet in the MAC control element.

8. The method of claim 1 wherein no specific component carrier identifier field is included for each power headroom report.

9. A method of receiving power headroom reports at a base station from a wireless terminal, the method comprising:

providing a primary component carrier and at least two secondary component carriers for uplink communications from the wireless terminal to the base station, wherein the at least two secondary component carriers include first and second secondary component carriers, wherein a respective component carrier index is assigned to each of the at least two secondary component carriers provided for the wireless terminal;

receiving a MAC control element including power headroom reports for the primary component carrier and for each of the at least two secondary component carriers from the wireless terminal over one of the component carriers, wherein the power headroom report for the primary component carrier is included in an 8 bit primary component carrier octet of the MAC control element, wherein the power headroom report for the first secondary component carrier is included in an 8 bit first secondary component carrier octet of the MAC control element, wherein the power headroom report for the second secondary component carrier is included in an 8 bit second secondary component carrier octet of the MAC control element, and wherein no specific component carrier identifier and no component carrier index is included in the 8 bit primary component carrier octet, in the 8 bit first secondary component carrier octet, and in the 8 bit second secondary component carrier octet; and

associating each of the power headroom reports of the MAC control element with a respective one of the primary and/or secondary component carriers based on an order in which the power headroom reports are arranged in the MAC control element and based on the component carrier indices assigned to each of the at least two secondary component carriers.

10. A method according to claim 9 wherein the power headroom report for the primary component carrier precedes the power headroom reports for each of the at least two secondary component carriers in the MAC control element, and wherein each of the at least two secondary component carriers are arranged in ascending order of the respective component carrier indices in the MAC control element.

11. A method according to claim 9 wherein the power headroom report for each of the primary and secondary component carriers includes a Type 1 power headroom level for a physical uplink shared channel of the respective component carrier.

12. A method according to claim 11, wherein the power headroom report for the primary component carrier is a first power headroom report for the primary component carrier, and wherein the MAC control element includes a second power headroom report for the primary component carrier including a Type 2 power headroom level for the primary component carrier.

13. A method according to claim 9 wherein providing the plurality of component carriers comprises configuring and/or activating each of the at least two secondary component carriers for uplink transmissions from the wireless terminal to the base station.

14. A method according to claim 9, wherein the power headroom report for the primary component carrier is a first power headroom report for the primary component carrier including a Type 1 power headroom level for the primary component carrier, wherein the MAC control element includes a second power headroom report for the primary component carrier including a Type 2 power headroom level for the primary component carrier, wherein the second power headroom report for the primary component carrier is included in an 8 bit second primary component carrier octet, wherein the second power headroom report for the primary component carrier precedes the first power headroom report for the primary component carrier in the MAC control element, wherein the power headroom reports for the first and second secondary component carriers include respective Type 1 power headroom levels, and wherein the power headroom reports for the at least two secondary component carriers follow the first and second power headroom reports for the primary component carrier.

15. The method of claim 14 wherein the MAC control element includes an eight bit header octet including a Logical Channel Identification (LCID) identifying the MAC control element as providing power headroom reports, wherein the first and second power headroom reports for the primary component carrier follow the header octet in the MAC control element.

16. The method of claim 9 wherein no specific component carrier identifier field is included for each power headroom report.

17. A wireless terminal comprising:

a processor configured to generate information for uplink transmissions provided over a primary component carrier and at least two secondary component carriers from the wireless terminal to a base station, wherein the at least two secondary component carriers include first and second secondary component carriers, wherein a respective component carrier index is assigned to each of the at least two secondary component carriers provided for the wireless terminal, configured to generate respective power headroom reports for the primary and secondary component carriers, and configured to generate a MAC control element including the power headroom reports for the primary component carrier and for each of the at least two secondary component carriers, wherein the power headroom reports for each of the at least two secondary component carriers are arranged in order of the respective component carrier indices, wherein the power headroom report for the primary component carrier is included in an 8 bit primary component carrier octet of the MAC control element, wherein the power headroom report for the first secondary component carrier is included in an 8 bit first secondary component carrier octet of the MAC control element, wherein the power headroom report for the second secondary component carrier is included in an 8 bit second secondary component carrier octet of the MAC control element, and wherein no specific component carrier identifier and no component carrier index is included in the 8 bit primary component carrier octet, in the 8 bit first secondary component carrier octet, and in the 8 bit second secondary component carrier octet; and

a transceiver coupled to the processor wherein the transceiver is configured to transmit the MAC control element including the power headroom reports for the primary and secondary component carriers from the wireless terminal to the base station over one of the component carriers.

18. A wireless terminal according to claim 17 wherein the power headroom report for the primary component carrier precedes the power headroom reports for each of the at least two secondary component carriers in the MAC control element, and wherein each of the at least two secondary component carriers are arranged in ascending order of the respective component carrier indices.

19. A wireless terminal according to claim 17 wherein the power headroom report for each of the primary and secondary component carriers includes a Type 1 power headroom level for a physical uplink shared channel of the respective component carrier.

20. A wireless terminal according to claim 19, wherein the power headroom report for the primary component carrier is a first power headroom report of the primary component carrier, and wherein the MAC control element includes a second power headroom report for the primary component carrier including a Type 2 power headroom level of the primary component carrier.

21. A wireless terminal according to claim 17 wherein each of the at least two secondary component carriers are configured and/or activated for uplink transmissions from the wireless terminal to the base station.

22. A base station comprising:

an assignment processor configured to provide a primary component carrier and at least two secondary component carriers for uplink communications from the wireless terminal to the base station, wherein the at least two secondary component carriers include first and second secondary component carriers, wherein a respective component carrier index is assigned to each of the at least two secondary component carriers provided for the wireless terminal; and

RF circuitry coupled to the assignment processor 732, wherein the RF circuitry 720 is configured to receive a MAC control element including power headroom reports for the primary component carrier and for each of the at least two secondary component carriers from the wireless terminal over one of the component carriers; and

wherein the assignment processor is further configured to associate each of the power headroom reports of the MAC control element with a respective one of the primary and/or secondary component carriers based on an order in which the power headroom reports are arranged in the MAC control element and based on the component carrier indices assigned to the secondary component carriers, wherein the power headroom report for the primary component carrier is included in an 8 bit primary component carrier octet of the MAC control element, wherein the power headroom report for the first secondary component carrier is included in an 8 bit first secondary component carrier octet of the MAC control element, wherein the power headroom report for the second secondary component carrier is included in an 8 bit second secondary component carrier octet of the MAC control element, and wherein no specific component carrier identifier and no component carrier index is included in the 8 bit primary component carrier octet, in the 8 bit first secondary component carrier octet, and in the 8 bit second secondary component carrier octet.

23. A base station according to claim 22 wherein the power headroom report for the primary component carrier precedes the power headroom reports for each of the at least two secondary component carriers in the MAC control element, and wherein each of the at least two secondary component carriers are arranged in ascending order of the respective component carrier indices.

24. A base station according to claim 22 wherein the power headroom report for each of the primary and secondary component carriers includes a Type 1 power headroom level for a physical uplink shared channel of the respective component carrier.

25. A base station according to claim 24, wherein the power headroom report for the primary component carrier is a first power headroom report for the primary component carrier, and wherein the MAC control element includes a second power headroom report for the primary component carrier including a Type 2 power headroom level of the primary component carrier.

26. A base station according to claim 22 wherein providing the plurality of component carriers comprises configuring and/or activating each of the at least two secondary component carriers for uplink transmissions from the wireless terminal to the base station.