METHOD FOR TRANSMITTING SIGNAL FOR MTC AND APPARATUS FOR SAME

• US 20160381712A1
• Filed: 07/28/2014
• Published: 12/29/2016
• 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
• Granted Patent: US 9,860,919 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 transmitting and receiving a signal by a user equipment (UE) in a wireless communication system supporting repeated transmission of a same signal, the method comprising:

repeatedly transmitting a first physical random access channel (PRACH) signal a first repetition number of times using a first PRACH resource;

receiving a random access response (RAR) for the first PRACH signal; and

transmitting a second PRACH signal for a scheduling request,

wherein a plurality of PRACH resources are preconfigured for transmission of the second PRACH signal, and a second plurality of repetition numbers are preconfigured for the plurality of PRACH resources, the second plurality of repetition numbers being different,

wherein when the first PRACH resource corresponds to one of the plurality of PRACH resources, the second PRACH signal is repeatedly transmitted using the first PRACH resource a repetition number of times configured for the first PRACH signal, and

wherein when the first repetition number corresponds to one of the second plurality of repetition numbers, the second PRACH signal is repeatedly transmitted using a PRACH resource corresponding to the first repetition number of times from among the plurality of PRACH resources.

2. The method according to claim 1, wherein when the first PRACH resource does not correspond to one of the plurality of PRACH resources and the first repetition number does not correspond to one of the second plurality of repetition numbers, the second PRACH signal is transmitted using a PRACH resource corresponding to a smallest repetition number from among repetition numbers greater than the first repetition number from among the plurality of PRACH resources.

3. The method according to claim 1, wherein when the first PRACH resource does not correspond to one of the plurality of PRACH resources and the first repetition number does not correspond to one of the second plurality of repetition numbers, the second PRACH signal is transmitted using a PRACH resource corresponding to a greatest repetition number from among repetition numbers smaller than the first repetition number from among the plurality of PRACH resources.

4. The method according to claim 1, wherein when a PRACH repetition number is signaled through a higher layer signal or a physical downlink control channel (PDCCH) signal, the second PRACH signal is transmitted using a PRACH resource corresponding to the signaled PRACH repetition number from among the plurality of PRACH resources.

5. The method according to claim 1, wherein a first plurality of repetition numbers are configured for reception of the random access response, and

wherein when the random access response is received using a specific repetition number from among the first plurality of repetition numbers, a response signal for the second PRACH signal is received using the specific repetition number.

6. The method according to claim 1, wherein a first plurality of repetition numbers are configured for reception of the random access response, and the first plurality of repetition numbers correspond to respective resources used for transmission of the first PRACH signal, and

wherein a response signal for the second PRACH signal is received using a repetition number corresponding to a resource used for transmission of the first PRACH signal.

7. A user equipment for transmitting and receiving a signal in a wireless communication system supporting repeated transmission of a same signal, the UE comprising:

a radio frequency (RF) unit; and

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

repeatedly transmit a first physical random access channel (PRACH) signal a first repetition number of times using a first PRACH resource,

receive a random access response (RAR) for the first PRACH signal; and

transmitting a second PRACH signal for a scheduling request,

wherein a plurality of PRACH resources are preconfigured for transmission of the second PRACH signal, and a second plurality of repetition numbers are preconfigured for the plurality of PRACH resources, the second plurality of repetition numbers being different,

wherein when the first PRACH resource corresponds to one of the plurality of PRACH resources, the second PRACH signal is repeatedly transmitted using the first PRACH resource a repetition number of times configured for the first PRACH signal, and

wherein when the first repetition number corresponds to one of the second plurality of repetition numbers, the second PRACH signal is repeatedly transmitted using a PRACH resource corresponding to the first repetition number from among the plurality of PRACH resources.

8. The user equipment according to claim 7, wherein when the first PRACH resource does not correspond to one of the plurality of PRACH resources and the first repetition number does not correspond to one of the second plurality of repetition numbers, the second PRACH signal is transmitted using a PRACH resource corresponding to a smallest repetition number from among repetition numbers greater than the first repetition number from among the plurality of PRACH resources.

9. The user equipment according to claim 7, wherein when the first PRACH resource does not correspond to one of the plurality of PRACH resources and the first repetition number does not correspond to one of the second plurality of repetition numbers, the second PRACH signal is transmitted using a PRACH resource corresponding to a greatest repetition number from among repetition numbers smaller than the first repetition number from among the plurality of PRACH resources.

10. The user equipment according to claim 7, wherein when a PRACH repetition number is signaled through a higher layer signal or a physical downlink control channel (PDCCH) signal, the second PRACH signal is transmitted using a PRACH resource corresponding to the signaled PRACH repetition number from among the plurality of PRACH resources.

11. The user equipment according to claim 7, wherein a first plurality of repetition numbers are configured for reception of the random access response, and

wherein when the random access response is received using a specific repetition number from among the first plurality of repetition numbers, a response signal for the second PRACH signal is received using the specific repetition number.

12. The user equipment according to claim 7, wherein a first plurality of repetition numbers are configured for reception of the random access response, and the first plurality of repetition numbers correspond to respective resources used for transmission of the first PRACH signal, and

wherein a response signal for the second PRACH signal is received using a repetition number corresponding to a resource used for transmission of the first PRACH signal.