Method for transmitting signal for MTC and apparatus for same

• US 9,860,919 B2
• Filed: 07/28/2014
• Issued: 01/02/2018
• Est. Priority Date: 07/26/2013
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Yang, Suckchel, Ahn, Joonkui, Yi, Yunjung, You, Hyangsun, Kim, Bonghoe
• Primary Examiner(s): Pham, Brenda H
• Application Number:
  US14/903,447
• Publication Number:
  US 20160381712A1
• Time in Patent Office: 1,254 Days
• Field of Search: 3703102, 370314, 370321, 370319, 370330, 370338, 370328
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 74/08 Non-scheduled access, e.g. ALOHA hybrid access H04W74/02
• CPC Class Codes: H04W 74/0833 Random access procedures, e.g. with 4-step access
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

The present invention relates to a method for transreceiving a signal 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 the steps of: repeatedly transmitting a first physical random access channel (PRACH) signal by using a first PRACH resource, wherein the number of transmissions equal a first repetition number; receiving a random access response (RAR) with respect to the first PRACH signal; and transmitting a second PRACH signal for requesting scheduling, wherein a plurality of PRACH resources are pre-established for transmitting the second PRACH signal, a second plurality of repetition numbers that are different are pre-established for the plurality of PRACH resources, wherein the second PRACH signal is repeatedly transmitted by using the first PRACH resource, wherein the number of transmissions equal a repetition number set for the first PRACH resource, when the first PRACH resource matches one of the plurality of PRACH resources, and wherein the second PRACH signal is repeatedly transmitted by using a PRACH resource corresponding to the first repetition number from among the plurality of PRACH resources, wherein the number of transmissions equal the first repetition number, when the first repetition number matches one of the second plurality of repetition numbers.

Claims

1. A method for performing a random access procedure by a user equipment (UE) in a wireless communication system supporting coverage enhancement, the method comprising:

receiving a physical downlink control channel (PDCCH) order from a base station, the PDCCH order initiating the random access procedure;

selecting a physical random access channel (PRACH) resource indicated by the PDCCH order from among a plurality of PRACH resources configured for the UE; and

repeatedly transmitting a PRACH preamble with a number of repetitions corresponding to the selected PRACH resource,

wherein each of the plurality of PRACH resources comprises a different number of repetitions for transmitting the PRACH preamble, and

wherein the number of repetitions for transmitting the PRACH preamble is indicated by the PDCCH order.

2. The method according to claim 1, wherein each of the plurality of PRACH resources further comprises a start subframe for transmitting the PRACH preamble, and a subframe configuration for transmitting the PRACH preamble.

3. The method according to claim 1, further comprising:

repeatedly receiving a random access response (RAR) from the base station in response to the PRACH preamble,

wherein a number of repetitions for receiving the RAR is configured specifically for each of the plurality of PRACH resources.

4. The method according to claim 3, further comprising:

repeatedly transmitting a physical uplink shared channel (PUSCH) to the base station based on the RAR,

wherein a number of repetitions for transmitting the PUSCH is configured specifically for each of the plurality of PRACH resources.

5. The method according to claim 4, further comprising:

repeatedly receiving a physical downlink shared channel (PDSCH) from the base station in response to the PUSCH,

wherein a number of repetitions for receiving the PDSCH is configured specifically for each of the plurality of PRACH resources.

6. The method according to claim 1, further comprising:

when the UE fails to receive a RAR in response to the PRACH preamble, increasing the number of repetitions and repeatedly transmitting the PRACH preamble with the increased number of repetitions.

7. A user equipment (UE) for performing a random access procedure in a wireless communication system supporting coverage enhancement, the UE comprising:

a radio frequency (RF) unit; and

a processor operatively connected to the RF unit and configured to;

receive a physical downlink control channel (PDCCH) order from a base station through the RF unit, the PDCCH order initiating the random access procedure,

select a physical random access channel (PRACH) resource indicated by the PDCCH order from among a plurality of PRACH resources configured for the UE, and

repeatedly transmit a PRACH preamble with a number of repetitions corresponding to the selected PRACH resource,

wherein each of the plurality of PRACH resources comprises a different number of repetitions for transmitting the PRACH preamble, and

wherein the number of repetitions for transmitting the PRACH preamble is indicated by the PDCCH order.

8. The user equipment (UE) according to claim 7, wherein each of the plurality of PRACH resources further comprises a start subframe for transmitting the PRACH preamble, and a subframe configuration for transmitting the PRACH preamble.

9. The user equipment (UE) according to claim 7, wherein the processor is further configured to:

repeatedly receive a random access response (RAR) from the base station through the RF unit in response to the PRACH preamble,

wherein a number of repetitions for receiving the RAR is configured specifically for each of the plurality of PRACH resources.

10. The user equipment (UE) according to claim 9, wherein the processor is further configured to:

repeatedly transmit a physical uplink shared channel (PUSCH) to the base station based on the RAR through the RF unit,

wherein a number of repetitions for transmitting the PUSCH is configured specifically for each of the plurality of PRACH resources.

11. The user equipment (UE) according to claim 10, wherein the processor is further configured to:

repeatedly receive a physical downlink shared channel (PDSCH) from the base station through the RF unit in response to the PUSCH,

wherein a number of repetitions for receiving the PDSCH is configured specifically for each of the plurality of PRACH resources.

12. The user equipment (UE) according to claim 7, wherein the processor is further configured to:

when the UE fails to receive a RAR in response to the PRACH preamble, increase the number of repetitions and repeatedly transmit the PRACH preamble with the increased number of repetitions.