Wireless communication system, base station apparatus, mobile station apparatus, wireless communication method, control program for mobile station apparatus, and integrated circuit for base station apparatus and mobile station apparatus

{
  "publication_number": "US2012263060A1",
  "country": "US",
  "kind": "A1",
  "title": "Wireless communication system, base station apparatus, mobile station apparatus, wireless communication method, control program for mobile station apparatus, and integrated circuit for base station apparatus and mobile station apparatus",
  "abstract": "Efficient transmission control of power headroom is performed by a mobile station apparatus that includes a power headroom control unit which manages a power headroom which is a difference between a maximum transmit power value determined for each uplink carrier component by a base station and a predetermined power value estimated for uplink transmission. A path loss measurement unit monitors a path loss of a downlink carrier component informed from the base station among a plurality of downlink carrier components. When a path loss value of any downlink carrier component changes more than a predetermined value, the power headroom control unit modifies transmission to the base station apparatus of the power headroom for uplink transmission corresponding to all the downlink carrier components set by the base station apparatus.",
  "claims": [
    "1. A wireless communication system in which a mobile station apparatus transmits a power headroom for each uplink component carrier to a base station apparatus, wherein said base station apparatus informs said mobile station apparatus of a plurality of uplink component carriers on which said mobile station apparatus triggers report of said power headrooms, and wherein said mobile station apparatus triggers the report of the power headrooms in the plurality of uplink component carriers when a predetermined condition is satisfied. 2. The wireless communication system according to claim 1, wherein said mobile station apparatus, when having triggered transmission of the power headrooms, and when an uplink radio resource for initial transmission is assigned, calculates said triggered power headrooms of the plurality of uplink component carriers, and transmits said calculated power headrooms of the plurality of uplink component carriers by said assigned uplink radio resource for initial transmission. 3. The wireless communication system according to claim 1, wherein said base station apparatus sets to said mobile station apparatus a plurality of downlink component carriers used for wireless communication with said mobile station apparatus, and wherein said predetermined condition is that a path loss value for at least one of the plurality of downlink component carriers set by said base station apparatus changes more than a predetermined value. 4. The wireless communication system according to claim 1, wherein said base station apparatus sets to said mobile station apparatus a plurality of downlink component carriers used for wireless communication with said mobile station apparatus; and sets to said mobile station apparatus one specific downlink component carrier of said plurality of downlink component carriers used for wireless communication, and wherein said predetermined condition is that a path loss value for said one specific downlink component carrier set by said base station apparatus changes more than a predetermined value. 5. The wireless communication system according to claim 3, wherein said base station apparatus sets one first timer (prohibitPHR-Timer) to said mobile station apparatus, and wherein said predetermined condition is further that said only one first timer (prohibitPHR-Timer) set by said base station apparatus has expired. 6. The wireless communication system according to claim 1, wherein said base station apparatus sets one second timer (periodicPHR-Timer) to said mobile station apparatus, and wherein said predetermined condition is that said only one second timer (periodicPHR-Timer) set by said base station apparatus expires. 7. The wireless communication system according to claim 5, wherein said mobile station apparatus makes said first timer (prohibitPHR-Timer) and said second timer (periodicPHR-Timer) start or restart when having transmitted the power headrooms of said plurality of uplink component carriers. 8. The wireless communication system according to claim 1, wherein said predetermined condition is that configuration or reconfiguration has been performed regarding a report functionality of said power headroom. 9. The wireless communication system according to claim 8, wherein configuration or reconfiguration of the reporting functionality of said power headroom is not used to disable said reporting functionality. 10. A wireless communication system in which a mobile station apparatus transmits a power headroom for each uplink component carrier to a base station apparatus, wherein said mobile station apparatus calculates a power headroom of a first uplink component carrier using a predetermined resource amount of a PUSCH when transmitting the power headroom of said first uplink component carrier by a second uplink component carrier, and wherein said base station apparatus determines that the power headroom of said first uplink component carrier has been calculated by said mobile station apparatus using the predetermined resource amount of the PUSCH. 11. The wireless communication system according to claim 10, wherein when a resource of the PUSCH is assigned to said first uplink component carrier by said base station apparatus when said mobile station apparatus transmits said power headroom, said mobile station apparatus calculates the power headroom of said first uplink component carrier using the resource amount of the PUSCH assigned to said first uplink component carrier, and said base station apparatus determines that the power headroom of said first uplink component carrier has been calculated by said mobile station apparatus using the resource amount of the PUSCH assigned to said first uplink component carrier. 12. The wireless communication system according to claim 10, wherein said predetermined resource amount of the PUSCH is a resource amount of the PUSCH assigned by said base station apparatus to the second uplink component carrier which transmits said power headroom. 13. The wireless communication system according to claim 10, wherein said predetermined resource amount of the PUSCH is one physical resource block, and said physical resource block is a unit to assign the PUSCH to said mobile station apparatus. 14. A wireless communication system in which a mobile station apparatus transmits a power headroom for each uplink component carrier to a base station apparatus, wherein said mobile station apparatus calculates the power headroom of said uplink component carrier using a predetermined PUCCH format, and wherein said base station apparatus determines that said power headroom has been calculated by said mobile station apparatus using the predetermined PUCCH format. 15. The wireless communication system according to claim 14, wherein when transmitting a PUCCH in the uplink component carrier on which said power headroom is calculated when said mobile station apparatus transmits said power headroom, said mobile station apparatus calculates the power headroom of the uplink component carrier which transmits said PUCCH using the PUCCH format of said PUCCH to be transmitted, and said base station apparatus determines that the power headroom of the uplink component carrier which transmits said PUCCH has been calculated by said mobile station apparatus using the PUCCH format of the PUCCH to be transmitted in said uplink component carrier. 16. A wireless communication system in which a mobile station apparatus transmits a power headroom for each uplink component carrier to a base station apparatus, wherein said mobile station apparatus calculates the power headroom of said uplink component carrier using an offset value with respect to a predetermined PUCCH format, and wherein said base station apparatus determines that said power headroom has been calculated by said mobile station apparatus using the offset value with respect to the predetermined PUCCH format. 17. The wireless communication system according to claim 16, wherein when transmitting the PUCCH in the uplink component carrier on which said power headroom is calculated when said mobile station apparatus transmits said power headroom, said mobile station apparatus calculates the power headroom of the uplink component carrier which transmits said PUCCH using the offset value with respect to the PUCCH format of said PUCCH to be transmitted, and said base station apparatus determines that the power headroom of the uplink component carrier which transmits said PUCCH has been calculated by said mobile station apparatus using the offset value with respect to the PUCCH format of the PUCCH to be transmitted in said uplink component carrier. 18. The wireless communication system according to claim 16, wherein said offset value is specified from said base station apparatus for each PUCCH format. 19. The wireless communication system according to claim 16, wherein said offset value is calculated from the number of bits of uplink control information transmitted by said PUCCH. 20. The wireless communication system according to claim 16, wherein the offset value with respect to said predetermined PUCCH format is an offset value with respect to a PUCCH format 1 a used to transmit 1 bit of HARQ bit. 21. A base station apparatus which receives a power headroom for each uplink component carrier transmitted by a mobile station apparatus, wherein said base station apparatus informs said mobile station apparatus of a plurality of uplink component carriers on which said mobile station apparatus triggers report of said power headrooms. 22. A base station apparatus which receives a power headroom for each uplink component carrier transmitted by a mobile station apparatus, wherein when having received a power headroom of a first uplink component carrier by a second uplink component carrier, said base station apparatus determines that the power headroom of said first uplink component carrier has been calculated by said mobile station apparatus using a predetermined resource amount of a PUSCH. 23. A base station apparatus which receives a power headroom for each uplink component carrier transmitted by a mobile station apparatus, wherein said base station apparatus determines that said received power headroom has been calculated by said mobile station apparatus using a predetermined PUCCH format. 24. A base station apparatus which receives a power headroom for each uplink component carrier transmitted by a mobile station apparatus, wherein said base station apparatus determines that said received power headroom has been calculated by said mobile station apparatus using an offset value with respect to a predetermined PUCCH format. 25. A mobile station apparatus which transmits a power headroom for each uplink component carrier to a base station apparatus, wherein when a predetermined condition is satisfied, said mobile station apparatus triggers report of the power headrooms in the plurality of uplink component carriers. 26. A mobile station apparatus which transmits a power headroom for each uplink component carrier to a base station apparatus, wherein when transmitting a power headroom of a first uplink component carrier by a second uplink component carrier, said mobile station apparatus calculates the power headroom of said first uplink component carrier using a predetermined resource amount of a PUSCH. 27. A mobile station apparatus which transmits a power headroom for each uplink component carrier to a base station apparatus, wherein said mobile station apparatus calculates the power headroom of said uplink component carrier using a predetermined PUCCH format. 28. A mobile station apparatus which transmits a power headroom for each uplink component carrier to a base station apparatus, wherein said mobile station apparatus calculates the power headroom of said uplink component carrier using an offset value with respect to a predetermined PUCCH format. 29. A wireless communication method used for a base station apparatus which receives a power headroom for each uplink component carrier transmitted by a mobile station apparatus, wherein said base station apparatus informs said mobile station apparatus of the plurality of uplink component carriers on which said mobile station apparatus triggers report of said power headrooms. 30. A wireless communication method used for a base station apparatus which receives a power headroom for each uplink component carrier transmitted by a mobile station apparatus, wherein when having received a power headroom of a first uplink component carrier by a second uplink component carrier, said base station apparatus determines that the power headroom of said first uplink component carrier has been calculated by said mobile station apparatus using a predetermined resource amount of a PUSCH. 31. A wireless communication method used for a base station apparatus which receives a power headroom for each uplink component carrier transmitted by a mobile station apparatus, wherein said base station apparatus determines that said received power headroom has been calculated by said mobile station apparatus using a predetermined PUCCH format. 32. A wireless communication method used for a base station apparatus which receives a power headroom for each uplink component carrier transmitted by a mobile station apparatus, wherein said base station apparatus determines that said received power headroom has been calculated by said mobile station apparatus using an offset value with respect to a predetermined PUCCH format. 33. A wireless communication method used for a mobile station apparatus which transmits a power headroom for each uplink component carrier to a base station apparatus, wherein when a predetermined condition is satisfied, said mobile station apparatus triggers report of the power headrooms in the plurality of uplink component carriers. 34. A wireless communication method used for a mobile station apparatus which transmits a power headroom for each uplink component carrier to a base station apparatus, wherein when transmitting a power headroom of a first uplink component carrier by a second uplink component carrier, said mobile station apparatus calculates the power headroom of said first uplink component carrier using a predetermined resource amount of a PUSCH. 35. A wireless communication method used for a mobile station apparatus which transmits a power headroom for each uplink component carrier to a base station apparatus, wherein said mobile station apparatus calculates the power headroom of said uplink component carrier using a predetermined PUCCH format. 36. A wireless communication method used for a mobile station apparatus which transmits a power headroom for each uplink component carrier to a base station apparatus, wherein said mobile station apparatus calculates the power headroom of said uplink component carrier using an offset value with respect to a predetermined PUCCH format. 37. A control program used for a mobile station apparatus which transmits a power headroom for each uplink component carrier to a base station apparatus, wherein when a predetermined condition is satisfied, processing for triggering report of the power headrooms in the plurality of uplink component carriers has been converted into a computer-readable and computer-executable command. 38. A control program used for a mobile station apparatus which transmits a power headroom for each uplink component carrier to a base station apparatus, wherein when said mobile station apparatus transmits a power headroom of a first uplink component carrier by a second uplink component carrier, processing for calculating the power headroom of said first uplink component carrier using a predetermined resource amount of a PUSCH has been converted into a computer-readable and computer-executable command. 39. A control program used for a mobile station apparatus which transmits a power headroom for each uplink component carrier to a base station apparatus, wherein processing for calculating the power headroom of said uplink component carrier using a predetermined PUCCH format has been converted into a computer-readable and computer-executable command. 40. A control program used for a mobile station apparatus which transmits a power headroom for each uplink component carrier to a base station apparatus, wherein processing for calculating the power headroom of said uplink component carrier using an offset value with respect to a predetermined PUCCH format has been converted into a computer-readable and computer-executable command. 41. An integrated circuit used for a base station apparatus which receives a power headroom for each uplink component carrier transmitted by a mobile station apparatus, wherein said integrated circuit has a step of informing said mobile station apparatus of the plurality of uplink component carriers on which said mobile station apparatus triggers report of said power headrooms. 42. An integrated circuit used for a base station apparatus which receives a power headroom for each uplink component carrier transmitted by a mobile station apparatus, wherein when said base station apparatus receives the power headroom of a first uplink component carrier by a second uplink component carrier, said integrated circuit has a step of determining that the power headroom of said first uplink component carrier has been calculated by said mobile station apparatus using a predetermined resource amount of a PUSCH. 43. An integrated circuit used for a base station apparatus which receives a power headroom for each uplink component carrier transmitted by a mobile station apparatus, wherein said base station apparatus determines that said received power headroom has been calculated by said mobile station apparatus using a predetermined PUCCH format. 44. An integrated circuit used for a base station apparatus which receives a power headroom for each uplink component carrier transmitted by a mobile station apparatus, wherein said integrated circuit has a step of determining that said received power headroom has been calculated by said mobile station apparatus using an offset value with respect to a predetermined PUCCH format. 45. An integrated circuit used for a mobile station apparatus which transmits a power headroom for each uplink component carrier to a base station apparatus, wherein said integrated circuit has a step of triggering report of the power headrooms in the plurality of uplink component carriers when a predetermined condition is satisfied. 46. An integrated circuit used for a mobile station apparatus which transmits a power headroom for each uplink component carrier to a base station apparatus, wherein when said mobile station apparatus transmits the power headroom of a first uplink component carrier by a second uplink component carrier, said integrated circuit has a step of calculating the power headroom of said first uplink component carrier using a predetermined resource amount of a PUSCH. 47. An integrated circuit used for a mobile station apparatus which transmits a power headroom for each uplink component carrier to a base station apparatus, wherein said integrated circuit has a step of calculating the power headroom of said uplink component carrier using a predetermined PUCCH format. 48. An integrated circuit used for a mobile station apparatus which transmits a power headroom for each uplink component carrier to a base station apparatus, wherein said integrated circuit has a step of calculating the power headroom of said uplink component carrier using an offset value with respect to a predetermined PUCCH format."
  ],
  "description_excerpt": "The present invention relates to a technology in which a mobile station apparatus transmits to a base station apparatus a remaining power value (power headroom) which is a difference between maximum transmit power and predetermined power estimated for uplink transmission.\n\nIn an uplink in wireless network evolution (hereinafter referred to as “LTE (Long Term. Evolution)” or “EUTRA (Evolved Universal Terrestrial Radio Access)”), TPC (Transmit Power Control) is performed for the purpose of suppressing power consumption of a mobile station apparatus, or reducing given interference to other cells. Shown is a formula used to decide a transmit power value of a PUSCH (Physical Uplink Shared CHannel) used for uplink data communication specified in Chapter 5 in Non-patent Document 1.\n\n[Formula   1] P PUSCH  (i)  =  min  { P CMAX, 10  log 10  (M PUSCH  (i)) +  P O_PUSCH  (j) + α  (j) · PL + Δ TF  (i) + f  (i) } =  min  { P CMAX, P req } (1)\n\nIn Formula (1), P PUSCH (i) indicates a transmit power value of the PUSCH in an i-th subframe. Min {X, Y} is a function for selecting a minimum value of X and Y. P O - PUSCH is transmit power as the basis for the PUSCH, and is a value specified by a higher layer. M PUSCH indicates the number of PRBs (Physical Resource Block), which is a unit for radio resource assignment used for PUSCH transmission, etc., and indicates that the transmit power becomes larger as the number of PRBs used for PUSCH transmission increases. In addition, PL indicates a path loss, and α is a coefficient multiplied to the path loss and is specified by the higher layer.",
  "cpc": [
    "H04W 72/21",
    "H04L 1/1812",
    "H04W 52/325",
    "H04W 52/34",
    "H04W 52/365",
    "H04W 72/0473",
    "Y02D 30/70"
  ],
  "ipc": [
    "H04W 24/10",
    "H04W 52/00",
    "H04W 72/04",
    "H04L 12/26",
    "H04W 52/36"
  ],
  "assignees": [
    "Sharp Corp"
  ],
  "inventors": [
    "Shoichi Suzuki",
    "Shohei Yamada"
  ],
  "filing_date": "2012-04-27",
  "publication_date": "2012-10-18",
  "priority_date": "2009-10-28",
  "application_number": "US-201213458177-A",
  "family_id": "43921741",
  "cited_by_count": 50,
  "citations": [
    "US20100118719A1",
    "US20120236811A1",
    "US20100232382A1",
    "US20100296471A1",
    "US20100296470A1",
    "US20100297993A1",
    "US20120281633A1"
  ]
}