Method for transmitting signal for MTC and apparatus for same

{
  "publication_number": "US9907055B2",
  "country": "US",
  "kind": "B2",
  "title": "Method for transmitting signal for MTC and apparatus for same",
  "abstract": "The present invention relates to a method for performing a random access procedure in a wireless communication system supporting repeated transmission of a same signal, and an apparatus for same, and more specifically, to a method and an apparatus for same, the method comprising: detecting a physical downlink control channel (PDCCH) signal; and transmitting a physical uplink shared channel (PUSCH) signal using an uplink grant, when the PDCCH signal includes the uplink grant, wherein the PUSCH signal is transmitted from a subframe having a first offset from among subframes from which the PDCCH signal has been detected, when user equipment is a first type of user equipment, wherein the PDCCH signal is repeatedly transmitted from a first plurality of subframe sections, when the user equipment is a second type of user equipment, wherein the transmission of the PUSCH signal begins from a subframe capable of starting repeated PUSCH transmission and closest to the last subframe in the first plurality of subframe sections, and wherein the subframe capable of starting repeated PUSCH transmission is determined in advanced through upper layer signaling.",
  "claims": [
    "1. A method for transmitting and receiving a signal by a user equipment (UE) in a wireless communication system supporting coverage enhancement, the method comprising: detecting a physical downlink control channel (PDCCH) signal; and transmitting a physical uplink shared channel (PUSCH) signal based on the detected PDCCH signal, wherein: when the UE is a first type UE, the PUSCH signal is transmitted in a subframe obtained by applying a first offset to a subframe in which the PDCCH signal is detected, when the UE is a second type UE, the PDCCH signal is repeatedly transmitted in a first plurality of subframes and the PUSCH signal begins to be repeatedly transmitted in a subframe which is obtained by applying the first offset to a last subframe of the first plurality of subframes within subframes in which PUSCH repeated transmission can be started, and the subframes in which PUSCH repeated transmission can be started are preconfigured via radio resource control (RRC) layer signaling.",
    "2. The method according to claim 1, further comprising: receiving a physical hybrid automatic repeat request (HARD) indicator channel (PHICH) signal for the PUSCH signal, wherein: when the UE is the first type UE, the PHICH signal is received in a subframe obtained by applying a second offset to a subframe in which the PUSCH signal is transmitted, when the UE is the second type UE, the PHICH signal begins to be repeatedly received in a subframe which is obtained by applying the second offset to a last subframe of repeatedly transmitting the PUSCH signal within subframes in which PHICH repeated transmission can be started, and the subframes in which PHICH repeated transmission can be started are preconfigured via the RRC layer signaling.",
    "3. The method according to claim 1, further comprising: when the PDCCH signal contains downlink grant, receiving a physical downlink shared channel (PDSCH) signal scheduled by the downlink grant, wherein: when the UE is the first type UE, the PDSCH signal is received in a subframe in which the PDCCH signal is detected, when the UE is the second type UE, the PDCCH signal is repeatedly transmitted in the first plurality of subframes, and the PDSCH signal begins to be repeatedly received in a subframe which is a last subframe of the first plurality of subframe intervals within subframes in which PDSCH repeated transmission can be started, and the subframes in which PDSCH repeated transmission can be started are preconfigured via the RRC layer signaling.",
    "4. The method according to claim 3, further comprising: transmitting a physical uplink control channel (PUCCH) signal containing a hybrid automatic repeat request acknowledgement (HARQ-ACK) signal for the PDSCH signal, wherein: when the UE is the first type UE, the PUCCH signal is transmitted in a subframe obtained by applying a third offset to a subframe in which the PDSCH signal is received, when the UE is the second type UE, the PUCCH signal begins to be repeatedly transmitted in a subframe which is a last subframe of repeatedly receiving the PDSCH signal within subframes in which PUCCH repeated transmission can be started, and the subframes in which PUCCH repeated transmission can be started are preconfigured via the RRC layer signaling.",
    "5. The method according to claim 1, wherein the second type UE supports a repeated transmission of a same signal for coverage enhancement and the first type UE does not support the repeated transmission of the same signal for coverage enhancement.",
    "6. A user equipment (UE) for transmitting and receiving a signal in a wireless communication system supporting coverage enhancement, the UE comprising: a radio frequency (RF) unit; and a processor connected to the RF unit during an operation of the processor, wherein the processor is configured to detect a physical downlink control channel (PDCCH) signal and transmit a physical uplink shared channel (PUSCH) signal based on the detected PDCCH signal, and wherein: when the UE is a first type UE, the PUSCH signal is transmitted in a subframe obtained by applying a first offset to a subframe, in which the PDCCH signal is detected, when the UE is a second type UE, the PDCCH signal is repeatedly transmitted in a first plurality of subframes and the PUSCH signal begins to be repeatedly transmitted in a subframe which is obtained by applying the first offset to a last subframe of the first plurality of subframes within subframes in which PUSCH repeated transmission can be started, and the subframes in which PUSCH repeated transmission can be started are preconfigured via radio resource control (RRC) layer signaling.",
    "7. The UE according to claim 6, wherein the processor is further configured to receive a physical hybrid automatic repeat request (HARD) indicator channel (PHICH) signal for the PUSCH signal, and wherein: when the UE is the first type UE, the PHICH signal is received in a subframe obtained by applying a second offset to a subframe in which the PUSCH signal is transmitted, when the UE is the second type UE, the PHICH signal begins to be repeatedly received in a subframe which is obtained by applying the second offset to a last subframe of repeatedly transmitting the PUSCH signal within subframes in which PHICH repeated transmission can be started, and the subframes in which PHICH repeated transmission can be started are preconfigured via the RRC layer signaling.",
    "8. The UE according to claim 6, wherein the processor is further configured to, when the PDCCH signal contains downlink grant, receive a physical downlink shared channel (PDSCH) signal scheduled by the downlink grant, and wherein: when the UE is the first type UE, the PDSCH signal is received in a subframe in which the PDCCH signal is detected, when the UE is the second type UE, the PDCCH signal is repeatedly transmitted in the first plurality of subframe intervals, and the PDSCH signal begins to be repeatedly received in a subframe which is a last subframe of the first plurality of subframes within subframes in which PDSCH repeated transmission can be started, and the subframes in which PDSCH repeated transmission can be started are preconfigured via the RRC layer signaling.",
    "9. The UE according to claim 8, wherein the processor is further configured to transmit a physical uplink control channel (PUCCH) signal containing a hybrid automatic repeat request acknowledgement (HARQ-ACK) signal for the PDSCH signal, and wherein: when the UE is the first type UE, the PUCCH signal is transmitted in a subframe obtained by applying a third offset to a subframe in which the PDSCH signal is received, when the UE is the second type UE, the PUCCH signal begins to be repeatedly transmitted in a subframe which is a last subframe of repeatedly receiving the PDSCH signal within subframes in which PUCCH repeated transmission can be started, and the subframes in which PUCCH repeated transmission can be started are preconfigured via the RRC layer signaling.",
    "10. The UE according to claim 6, wherein the second type UE supports a repeated transmission of a same signal for coverage enhancement and the first type UE does not support the repeated transmission of the same signal for coverage enhancement."
  ],
  "description_excerpt": "The present invention relates to a method and apparatus for transmitting a signal in a wireless communication system. More particularly, the present invention relates to a method and apparatus for transmitting and receiving a signal for machine type communication (MTC).\n\nRecently, wireless communication systems are widely developed to provide various kinds of communication services including audio communications, data communications and the like. Generally, a wireless communication system is a kind of a multiple access system capable of supporting communications with multiple users by sharing available system resources (e.g., bandwidth, transmission power, etc.). For instance, multiple access systems include CDMA (code division multiple access) system, FDMA (frequency division multiple access) system, TDMA (time division multiple access) system, OFDMA (orthogonal frequency division multiple access) system, SC-FDMA (single carrier frequency division multiple access) system, MC-FDMA (multi carrier frequency division multiple access) and the like. In a wireless communication system, a user equipment (UE) may receive information from a base station in downlink (DL), and the user equipment may transmit information to the base station in uplink (UL). The information transmitted or received by the UE may include data and various control information. In addition, there are various physical channels according to the type or use of the information transmitted or received by the UE.",
  "cpc": [
    "H04W 72/20",
    "H04L 1/1812",
    "H04L 1/189",
    "H04L 5/0053",
    "H04L 5/0055",
    "H04L 5/0094",
    "H04W 4/005",
    "H04W 4/021",
    "H04W 4/70",
    "H04W 72/0406",
    "H04W 72/14",
    "H04W 72/23",
    "H04W 74/0833",
    "H04W 74/0838"
  ],
  "ipc": [
    "H04L 1/18",
    "H04W 4/021",
    "H04W 4/70",
    "H04W 72/04",
    "H04W 72/14",
    "H04L 5/00"
  ],
  "assignees": [
    "LG Electronics Inc"
  ],
  "inventors": [
    "Suckchel YANG",
    "Joonkui AHN",
    "Yunjung Yi",
    "Hyangsun You",
    "Bonghoe Kim"
  ],
  "filing_date": "2014-07-28",
  "publication_date": "2018-02-27",
  "grant_date": "2018-02-27",
  "priority_date": "2013-07-26",
  "application_number": "US-201414903018-A",
  "family_id": "52393597",
  "cited_by_count": 11,
  "citations": [
    "EP2424320A1",
    "US20130182632A1",
    "WO2012134107A2",
    "US20130223298A1",
    "WO2013012190A2",
    "US20140153453A1",
    "US20130083753A1",
    "WO2013051856A1",
    "WO2013058599A1",
    "US20130242882A1",
    "US20140044056A1"
  ]
}