METHOD FOR TRANSMITTING SIGNAL FOR MTC AND APPARATUS FOR SAME

• US 20180092130A1
• Filed: 12/01/2017
• Published: 03/29/2018
• 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
• Granted Patent: US 10,470,221 B2
• Time in Patent Office: Days
• 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

A method for performing a random access procedure by a user equipment (UE) in a wireless communication system supporting coverage enhancement, the method including transmitting, by the UE, a random access preamble and repeatedly receiving, by the UE, a physical downlink control channel (PDCCH) scheduling a random access response (RAR) in response to the random access preamble, wherein, starting subframe information for repeatedly receiving the PDCCH scheduling the RAR is signaled through a system information block (SIB).

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:

transmitting, by the UE, a random access preamble; and

repeatedly receiving, by the UE, a physical downlink control channel (PDCCH) scheduling a random access response (RAR) in response to the random access preamble,

wherein starting subframe information for repeatedly receiving the PDCCH scheduling the RAR is signaled through a system information block (SIB).

2. The method according to claim 1, wherein repetition number information for repeatedly receiving the PDCCH scheduling the RAR is signaled through the SIB.

3. The method according to claim 1, wherein the PDCCH scheduling the RAR is received through a common search space (CSS).

4. The method according to claim 1, wherein the PDCCH scheduling the RAR is received using a random access radio network temporary identifier (RA-RNTI).

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

receiving, by the UE, the RAR scheduled by the PDCCH; and

repeatedly transmitting, by the UE, a physical uplink shared channel (PUSCH) based on the RAR,

wherein repetition number information for the PUSCH is signaled through the RAR.

6. The method according to claim 5, wherein the RAR includes timing advance (TA) information and uplink grant information for transmitting the PUSCH.

7. The method according to claim 5, wherein the RAR is received through a physical downlink shared channel (PDSCH).

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

repeatedly receiving, by the UE, a PDCCH scheduling a contention resolution message in response to the PUSCH,

wherein starting subframe information for repeatedly receiving the PDCCH scheduling the contention resolution message is signaled through the SIB.

9. The method according to claim 8, wherein repetition number information for repeatedly receiving the PDCCH scheduling the contention resolution message is signaled through the SIB.

10. The method according to claim 8, wherein the contention resolution message is received through a physical downlink shared channel (PDSCH).

11. A user equipment (UE) 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;

control the RF unit to transmit a random access preamble, and control the RF unit to repeatedly receive a physical downlink control channel (PDCCH) scheduling a random access response (RAR) in response to the random access preamble,

wherein starting subframe information for repeatedly receiving the PDCCH scheduling the RAR is signaled through a system information block (SIB).

12. The UE according to claim 11, wherein repetition number information for repeatedly receiving the PDCCH scheduling the RAR is signaled through the SIB.

13. The UE according to claim 11, wherein the PDCCH scheduling the RAR is received through a common search space (CSS).

14. The UE according to claim 11, wherein the PDCCH scheduling the RAR is received using a random access radio network temporary identifier (RA-RNTI).

15. The UE according to claim 11, wherein the processor is further configured to:

control the RF unit to receive the RAR scheduled by the PDCCH, and

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

wherein repetition number information for the PUSCH is signaled through the RAR.

16. The UE according to claim 15, wherein the RAR includes timing advance (TA) information and uplink grant information for transmitting the PUSCH.

17. The UE according to claim 15, wherein the RAR is received through a physical downlink shared channel (PDSCH).

18. The UE according to claim 15, wherein the processor is further configured to control the RF unit to repeatedly receive a PDCCH scheduling a contention resolution message in response to the PUSCH,

wherein starting subframe information for repeatedly receiving the PDCCH scheduling the contention resolution message is signaled through the SIB.

19. The UE according to claim 18, wherein repetition number information for repeatedly receiving the PDCCH scheduling the contention resolution message is signaled through the SIB.

20. The UE according to claim 18, wherein the contention resolution message is received through a physical downlink shared channel (PDSCH).