Mobile communication method, radio terminal, and base station

{
  "publication_number": "US2013189973A1",
  "country": "US",
  "kind": "A1",
  "title": "Mobile communication method, radio terminal, and base station",
  "abstract": "A mobile communication method in which a radio terminal connects to a network so as to perform a communication, comprises: a step in which the radio terminal detects an occurrence of a connection failure with the network in a connected state; and a step of sending a radio link failure (RLF) report regarding the detected connection failure, from the radio terminal to the network. In the step of sending the RLF report, the radio terminal sends time information, which is contained in the RLF report, for identifying a time of occurrence of the connection failure, to the network.",
  "claims": [
    "1. A mobile communication method in which a radio terminal connects to a network so as to perform a communication, comprising: a step in which the radio terminal detects an occurrence of a connection failure with the network in a connected state; and a step of sending a radio link failure (RLF) report regarding the detected connection failure, from the radio terminal to the network, wherein in the step of sending the RLF report, the radio terminal sends time information, which is contained in the RLF report, for identifying a time of occurrence of the connection failure, to the network. 2. The mobile communication method according to claim 1, further comprising a step in which the radio terminal restores to the connected state by re-establishing a connection to the network after moving to an idle state by the occurrence of the connection failure, wherein in the step of sending the RLF report, the radio terminal sends the time information that is contained in the RLF report, to the network, after restoring to the connected state in the restoring step. 3. The mobile communication method according to claim 1, wherein in the step of sending the RLF report, the radio terminal sends the time information, the location information for identifying a location of occurrence of the connection failure, which are contained in the RLF report, to the network. 4. The mobile communication method according to claim 1, further comprising a step in which the network configures Immediate MDT on the radio terminal in the connected state, wherein the step of configuring includes a step of sending absolute time information indicating a network time from the network to the radio terminal. 5. The mobile communication method according to claim 4, wherein the time information included in the RLF report includes the absolute time information received from the network and relative time information indicating a relative time of a time of occurrence of the connection failure relative to the network time. 6. The mobile communication method according to claim 1, further comprising: a step in which the network broadcasts the absolute time information indicating a network time; and a step in which the radio terminal receives the absolute time information broadcasted from the network. 7. The mobile communication method according to claim 6, wherein the time information included in the RLF report includes the absolute time information received from the network and relative time information indicating a relative time of a time of occurrence of the connection failure relative to the network time. 8. The mobile communication method according to claim 6, wherein the time information included in the RLF report is based only on the absolute time information received from the network without including relative time information. 9. A radio terminal configured to connect to a network so as to perform a communication, comprising: a detection unit configured to detect an occurrence of connection failure with the network, in a connected state; and a transmission unit configured to send a radio link failure (RLF) report regarding the detected connection failure, to the network, wherein the transmission unit sends time information, which is contained in the RLF report, for identifying a time of occurrence of the connection failure to the network. 10. The radio terminal according to claim 9, further comprising a storage unit, wherein the storage unit stores the RLF information that is information about the detected connection failure and that should be included in the RLF report, separately from other information. 11. A base station configured to configure Immediate MDT on a radio terminal in a connected state, comprising a transmission unit configured to send absolute time information indicating a network time, to the radio terminal, when configuring the Immediate MDT. 12. Abase station, comprising a broadcast transmission unit configured to broadcast absolute time information indicating a network time."
  ],
  "cpc": [
    "H04W 76/27",
    "G06F 11/00",
    "H04L 1/0026",
    "H04L 41/069",
    "H04W 24/02",
    "H04W 24/04",
    "H04W 72/21",
    "H04W 72/51",
    "H04W 76/18"
  ],
  "assignees": [
    "CHANG HENRY",
    "FUKUTA NORIYOSHI",
    "KYOCERA CORP"
  ],
  "filing_date": "2011-10-04",
  "publication_date": "2013-07-25",
  "priority_date": "2010-10-04",
  "application_number": "US-201113877510-A",
  "family_id": "45928109",
  "citations": [
    "US2009257353A1",
    "US2010165836A1",
    "US2010190488A1",
    "US7043265B2"
  ]
}