Method for transmitting signal for MTC and apparatus for same

• US 10,470,221 B2
• Filed: 12/01/2017
• Issued: 11/05/2019
• 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:
  US15/828,762
• Publication Number:
  US 20180092130A1
• Time in Patent Office: 704 Days
• Field of Search: 370322, 370329, 370341, 370431, 370443, 3703102, 370328, 370338, 370349
• 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;

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);

receiving, by the LTE, the RAR scheduled by the PDCCH;

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; and

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.

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, wherein the RAR includes timing advance (TA) information and uplink grant information for transmitting the PUSCH.

6. The method according to claim 1, wherein the RAR is received through a physical downlink shared channel (PDSCH).

7. The method according to claim 1, wherein repetition number information for repeatedly receiving the PDCCH scheduling the contention resolution message is signaled through the SIB.

8. The method according to claim 1, wherein the contention resolution message is received through a physical downlink shared channel (PDSCH).

9. 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) transceiver; and

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

control the RF transceiver unit to transmit a random access preamble,

control the RF transceiver 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),

control the RF transceiver to receive the RAR scheduled by the PDCCH,

control the RF transceiver 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, and

control the RF transceiver 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.

10. The UE according to claim 9, wherein repetition number information for repeatedly receiving the PDCCH scheduling the RAR is signaled through the SIB.

11. The UE according to claim 9, wherein the PDCCH scheduling the RAR is received through a common search space (CSS).

12. The UE according to claim 9, wherein the PDCCH scheduling the RAR is received using a random access radio network temporary identifier (RA-RNTI).

13. The UE according to claim 9, wherein the RAR includes timing advance (TA) information and uplink grant information for transmitting the PUSCH.

14. The UE according to claim 9, wherein the RAR is received through a physical downlink shared channel (PDSCH).

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

16. The UE according to claim 9, wherein the contention resolution message is received through a physical downlink shared channel (PDSCH).