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

• US 9,210,671 B2
• Filed: 04/28/2011
• Issued: 12/08/2015
• 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:
  US13/128,122
• Publication Number:
  US 20120087317A1
• Time in Patent Office: 1,685 Days
• Field of Search: None
• US Class Current: 1/1
• 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 one secondary component carrier are provided for uplink transmissions from the wireless terminal to the base station, wherein a respective component carrier index is assigned to each of the at least one 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 one secondary component carriers;

generating a MAC control element including the power headroom reports for the primary and secondary component carriers, wherein a Type 2 and Type 1 power headroom reports for the primary component carrier are provided first, and then Type 1 power headroom reports for each of the at least one secondary component carriers are arranged in an order according to the component carrier indices for the respective secondary component carriers, and wherein no specific component carrier identifier field is included for each of the Type 1 power headroom reports for each of the at least one secondary component carriers; 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 Type 1 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 in the MAC control element.

3. A method according to claim 2 wherein the Type 2 power headroom report for the primary component carrier includes a Type 2 power headroom level of the primary component carrier in the MAC control element.

4. A method according to claim 3 wherein the Type I power headroom level is computed as P_cmax,c minus PUSCH power, and wherein the Type 2 power headroom level is computed as P_cmax,c minus PUCCH power minus PUSCH power.

5. A method according to claim 1 wherein each of the at least one 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 Type 1 power headroom reports for each of the at least one secondary component carriers are ordered in consecutive order according to the component carrier indices for the respective secondary component carriers.

7. A method according to claim 6 wherein the Type 2 power headroom report for the primary component carrier precedes the Type 1 power headroom reports for the primary component carrier and each of the at least one secondary component carriers in the MAC control element, wherein the Type 1 power headroom reports for each of the at least one secondary component carriers are arranged in ascending order according to the component carrier indices for the respective secondary component carriers.

8. The method of claim 1 wherein the at least one secondary component carrier includes first and second secondary component carriers, wherein the MAC control element begins with an eight bit header octet including a five bit Logical Channel Identification (LCID) identifying the MAC control element as providing power headroom reports, wherein the Type 2 power headroom report for the primary component carrier is provided in a first eight bit octet of the MAC control element following the header octet, wherein the Type 1 power headroom report for the primary component carrier is provided in a second 8 bit octet of the MAC control element following the header octet after the Type 2 power headroom report for the primary component carrier, wherein a Type 1 power headroom report for the first secondary component carrier is provided in a third eight bit octet of the MAC control element following the header octet after the Type 1 power headroom report for the primary component carrier, and wherein a Type 1 power headroom report for the second secondary component carrier is provided in a fourth eight bit octet of the MAC control element following the header octet after the Type 1 power headroom report for the first secondary component carrier, and wherein no specific component carrier identifier and no component carrier index is included in the eight bit octets for the Type 1 power headroom reports.

9. The method of claim 8 wherein the MAC control element includes only the eight bit header octet followed by the first eight bit octet for the Type 2 power headroom report for the primary component carrier, the second eight bit octet for the Type 1 power headroom report for the primary component carrier, and respective eight bit octets for each of the Type 1 power headroom reports for the respective secondary component carriers.

10. 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 one secondary component carrier for uplink communications from the wireless terminal to the base station, wherein a respective component carrier index is assigned to each of the at least one secondary component carriers provided for the wireless terminal;

receiving a MAC control element including power headroom reports for the primary and secondary component carriers from the wireless terminal over one of the component carriers, wherein a Type 2 and Type 1 power headroom reports for the primary component carrier are provided first, and then Type 1 power headroom reports for each of the at least one secondary component carriers are arranged in an order according to the component carrier indices for the respective secondary component carriers, and wherein no specific component carrier identifier field is included for each of the Type 1 power headroom reports for each of the at least one secondary component carriers; and

associating each of the Type 1 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 Type 2 power headroom reports are arranged in the MAC control element and based on the component carrier indices assigned to the primary component carrier and each of the at least one secondary component carriers.

11. A method according to claim 10 wherein the Type 1 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 in the MAC control element.

12. A method according to claim 11 wherein the Type 2 power headroom report for the primary component carrier includes a Type 2 power headroom level for the primary component carrier in the MAC control element.

13. A method according to claim 12 wherein the Type I power headroom level is computed as P_cmax,c minus PUSCH power, and wherein the Type 2 power headroom level is computed as P_cmax,c minus PUCCH power minus PUSCH power.

14. A method according to claim 10 wherein providing the plurality of component carriers comprises configuring and/or activating each of the at least one secondary component carriers for uplink transmissions from the wireless terminal to the base station.

15. A method according to claim 10 wherein the Type 1 power headroom reports for each of the at least one secondary component carriers are ordered in consecutive order according to the component carrier indices for the respective secondary component carriers.

16. A method according to claim 15 wherein the Type 2 power headroom report for the primary component carrier precedes the Type 1 power headroom reports for the primary component carrier and each of the at least one secondary component carriers in the MAC control element, and wherein the Type 1 power headroom reports for each of the at least one secondary component carriers are arranged in ascending order according to the component carrier indices for the respective secondary component carriers.

17. The method of claim 10 wherein the at least one secondary component carrier includes first and second secondary component carriers, wherein the MAC control element begins with an eight bit header octet including a five bit Logical Channel Identification (LCID) identifying the MAC control element as providing power headroom reports, wherein the Type 2 power headroom report for the primary component carrier is provided in a first eight bit octet of the MAC control element following the header octet, wherein the Type 1 power headroom report for the primary component carrier is provided in a second 8 bit octet of the MAC control element following the header octet after the Type 2 power headroom report for the primary component carrier, wherein a Type 1 power headroom report for the first secondary component carrier is provided in a third eight bit octet of the MAC control element following the header octet after the Type 1 power headroom report for the primary component carrier, and wherein a Type 1 power headroom report for the second secondary component carrier is provided in a fourth eight bit octet of the MAC control element following the header octet after the Type 1 power headroom report for the first secondary component carrier, and wherein no specific component carrier identifier and no component carrier index is included in the eight bit octets for the Type 1 power headroom reports.

18. The method of claim 17 wherein the MAC control element includes only the eight bit header octet followed by the first eight bit octet for the Type 2 power headroom report for the primary component carrier, the second eight bit octet for the Type 1 power headroom report for the primary component carrier, and respective eight bit octets for each of the Type 1 power headroom reports for the respective secondary component carriers.

19. A wireless terminal comprising:

a processor configured to generate information for uplink transmissions provided over a primary component carrier and at least one secondary component carrier from the wireless terminal to a base station wherein a respective component carrier index is assigned to each of the at least one 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 and secondary component carriers, wherein the processor is configured to provide a Type 2 and Type 1 power headroom reports for the primary component carrier first, and then arrange Type 1 power headroom reports for each of the at least one secondary component carriers in an order according to the component carrier indices for the respective secondary component carriers, and wherein no specific component carrier identifier field is included for each of the Type 1 power headroom reports for each of the at least one secondary component carriers; 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.

20. A wireless terminal according to claim 19 wherein the Type 1 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 in the MAC control element.

21. A wireless terminal according to claim 19 wherein the Type 2 power headroom report for the primary component carrier includes a Type 2 power headroom level of the primary component carrier in the MAC control element.

22. A wireless terminal according to claim 21 wherein the Type I power headroom level is computed as P_cmax,c minus PUSCH power, and wherein the Type 2 power headroom level is computed as P_cmax,c minus PUCCH power minus PUSCH power.

23. A wireless terminal according to claim 19 wherein each of the at least one secondary component carriers are configured and/or activated for uplink transmissions from the wireless terminal to the base station.

24. A wireless terminal according to claim 19 wherein the processor is further configured to order the Type 1 power headroom reports for each of the at least one secondary component carriers in consecutive order according to the component carrier indices for the respective secondary component carriers.

25. A wireless terminal according to claim 24 wherein the Type 2 power headroom report for the primary component carrier precedes the Type 1 power headroom reports for the primary component carrier and each of the at least one secondary component carriers in the MAC control element, wherein the processor is further configured to arrange the Type 1 power headroom reports for each of the at least one secondary component carriers in ascending order according to the component carrier indices for the respective secondary component carriers.

26. The wireless terminal of claim 19 wherein the at least one secondary component carrier includes first and second secondary component carriers, wherein the MAC control element begins with an eight bit header octet including a five bit Logical Channel Identification (LCID) identifying the MAC control element as providing power headroom reports, wherein the Type 2 power headroom report for the primary component carrier is provided in a first eight bit octet of the MAC control element following the header octet, wherein the Type 1 power headroom report for the primary component carrier is provided in a second 8 bit octet of the MAC control element following the header octet after the Type 2 power headroom report for the primary component carrier, wherein a Type 1 power headroom report for the first secondary component carrier is provided in a third eight bit octet of the MAC control element following the header octet after the Type 1 power headroom report for the primary component carrier, and wherein a Type 1 power headroom report for the second secondary component carrier is provided in a fourth eight bit octet of the MAC control element following the header octet after the Type 1 power headroom report for the first secondary component carrier, and wherein no specific component carrier identifier and no component carrier index is included in the eight bit octets for the Type 1 power headroom reports.

27. The wireless terminal of claim 26 wherein the MAC control element includes only the eight bit header octet followed by the first eight bit octet for the Type 2 power headroom report for the primary component carrier, the second eight bit octet for the Type 1 power headroom report for the primary component carrier, and respective eight bit octets for each of the Type 1 power headroom reports for the respective secondary component carriers.

28. A base station comprising:

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

RF circuitry coupled to the assignment processor, wherein the RF circuitry is configured to receive a MAC control element including power headroom reports for the primary and secondary component carriers from the wireless terminal over one of the component carriers, wherein a Type 2 and Type 1 power headroom reports for the primary component carrier are provided first, and then Type 1 power headroom reports for each of the at least one secondary component carriers are arranged in an order according to the component carrier indices for the respective secondary component carriers, and wherein no specific component carrier identifier field is included for each of the Type 1 power headroom reports for each of the at least one secondary component carriers;

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 component carriers.

29. A base station according to claim 28 wherein the Type 1 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 in the MAC control element.

30. A base station according to claim 29 wherein the Type 2 power headroom report for the primary component carrier includes a Type 2 power headroom level of the primary component carrier in the MAC control element.

31. A base station according to claim 30 wherein the Type I power headroom level is computed as P_cmax,c minus PUSCH power, and wherein the Type 2 power headroom level is computed as P_cmax,c minus PUCCH power minus PUSCH power.

32. A base station according to claim 28 wherein providing the plurality of component carriers comprises configuring and/or activating each of the at least one secondary component carriers for uplink transmissions from the wireless terminal to the base station.

33. A base station according to claim 28 wherein the Type 1 power headroom reports for each of the at least one secondary component carriers are ordered in consecutive order according to the component carrier indices for the respective secondary component carriers.

34. A base station according to claim 33 wherein the Type 2 power headroom report for the primary component carrier precedes the Type 1 power headroom reports for the primary component carrier and each of the at least one secondary component carriers in the MAC control element, wherein the Type 1 power headroom reports for each of the at least one secondary component carriers are arranged in ascending order according to the component carrier indices for the respective secondary component carriers.

35. The base station of claim 28 wherein the at least one secondary component carrier includes first and second secondary component carriers, wherein the MAC control element begins with an eight bit header octet including a five bit Logical Channel Identification (LCID) identifying the MAC control element as providing power headroom reports, wherein the Type 2 power headroom report for the primary component carrier is provided in a first eight bit octet of the MAC control element following the header octet, wherein the Type 1 power headroom report for the primary component carrier is provided in a second 8 bit octet of the MAC control element following the header octet after the Type 2 power headroom report for the primary component carrier, wherein a Type 1 power headroom report for the first secondary component carrier is provided in a third eight bit octet of the MAC control element following the header octet after the Type 1 power headroom report for the primary component carrier, wherein a Type 1 power headroom report for the second secondary component carrier is provided in a fourth eight bit octet of the MAC control element following the header octet after the Type 1 power headroom report for the first secondary component carrier, and wherein no specific component carrier identifier and no component carrier index is included in the eight bit octets for the Type 1 power headroom reports.

36. The base station of claim 35 wherein the MAC control element includes only the eight bit header octet followed by the first eight bit octet for the Type 2 power headroom report for the primary component carrier, the second eight bit octet for the Type 1 power headroom report for the primary component carrier, and respective eight bit octets for each of the Type 1 power headroom reports for the respective secondary component carriers.