METHOD FOR TRANSMITTING AND RECEIVING SIGNAL IN WIRELESS COMMUNICATION SYSTEM, AND APPARATUS THEREFOR

• US 20180034608A1
• Filed: 02/04/2016
• Published: 02/01/2018
• Est. Priority Date: 02/04/2015
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: SEO, Hanbyul, YI, Yunjung
• Granted Patent: US 10,348,468 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/00 Radio transmission systems, i.e. using radiation field H04B10/00, H04B15/00 take precedence
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04L 25/02 Details ; arrangements for supplying electrical power along data transmission lines systems for transmitting signals via power distribution lines H04B3/54
• CPC Class Codes: H04L 25/0228 with direct estimation from sounding signals
• CPC Class Codes: H04L 5/00 Arrangements affording multiple use of the transmission path
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 4/70 Services for machine-to-machine communication [M2M] or machine type communication [MTC]
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Provided are a method for transmitting and receiving signals in a wireless communication system including machine type communication (MTC), and a base station and a terminal therefor. The method for transmitting and receiving signals comprises the steps of: receiving repeatedly reference signals from a plurality of resource units; determining whether to perform bundling for the reference signals transmitted from at least one resource unit among the plurality of resource units; and, when it has been decided to perform bundling, estimating a channel by assuming the same precoding for the reference signals transmitted from the at least one resource unit. Whether to perform bundling is determined on the basis of the number of repetition of the reference signals and/or the number of antenna ports.

Claims

1. A method of receiving a signal, which is received by a user equipment (UE) in a wireless communication system, the method comprising:

repetitively receiving a reference signal from a plurality of resource units;

determining whether to perform bundling on a reference signal transmitted from at least one resource unit among a plurality of the resource units; and

if the bundling is determined to be performed, estimating a channel by assuming the same precoding on the reference signal transmitted from the at least one resource unit,

wherein whether to perform the bundling is determined based on at least one of a repetition count of the reference signal and the number of antenna ports.

2. The method of claim 1, further comprising:

determining a bundling size corresponding to the number of the at least one resource unit,

wherein the bundling size is determined based on at least one of the repetition count of the reference signal and the number of antenna ports.

3. The method of claim 1, wherein if the number of antenna ports is equal to or less than a reference value, the bundling is determined to be performed and wherein if the number of antenna ports is greater than the reference value, the bundling is determined not to be performed.

4. The method of claim 1, wherein the number of antenna ports corresponds to one selected from the group consisting of the number of common reference signal (CRS) ports, the number of channel status information-reference signal (CSI-RS) ports, and the number of CRS ports separately configured for a low-cost device.

5. The method of claim 3, wherein the reference value corresponds to a maximum value of the number of demodulation reference signal (DM RS) antenna ports capable of being used for a single physical resource block (PRB) pair.

6. The method of claim 3, wherein the reference value corresponds to a predetermined value.

7. The method of claim 1, wherein the resource unit corresponds to at least one of a physical resource block (PRB) and a subframe.

8. The method of claim 1, wherein the reference signal corresponds to a demodulation reference signal (DM RS).

9. The method of claim 1, wherein the reference signal corresponds to a reference signal for at least one of a control channel and a data channel.

10. The method of claim 9, wherein the control channel is transmitted in a time domain in which the data channel is transmitted.

11. The method of claim 10, wherein the control channel corresponds to an enhanced physical downlink channel (EPDCCH).

12. The method of claim 1, wherein the user equipment corresponds to a low-cost machine type communication (MTC) terminal.

13. A method of transmitting a signal, which is transmitted by an eNB in a wireless communication system, the method comprising:

repetitively transmitting a reference signal from a plurality of resource units; and

transmitting a reference signal from at least one resource unit among a plurality of the resource units using the same precoding;

wherein whether to perform bundling on the reference signal is determined based on a repetition count of the reference signal or the number of antenna ports.

14. A user equipment (UE) in a wireless communication system, the UE comprising:

a transceiver configured to repetitively receive a reference signal from a plurality of resource units; and

a processor, the processor configured to determine whether to perform bundling on a reference signal transmitted from at least one resource unit among a plurality of the resource units, the processor, if the bundling is determined to be performed, configured to estimate a channel by assuming the same precoding on the reference signal transmitted from the at least one resource unit,

wherein whether to perform the bundling is determined based on at least one of a repetition count of the reference signal and the number of antenna ports.

15. An eNB in a wireless communication system, the eNB comprising:

a transceiver configured to repetitively transmit a reference signal from a plurality of resource units; and

a processor, the processor configured to control the transceiver to transmit a reference signal from at least one resource unit among a plurality of the resource units using the same precoding,

wherein whether to perform bundling on the reference signal is determined based on a repetition count of the reference signal or the number of antenna ports.