METHOD AND APPARATUS FOR MONITORING DOWNLINK CONTROL CHANNEL IN WIRELESS COMMUNICATION SYSTEM

• US 20180167919A1
• Filed: 12/14/2017
• Published: 06/14/2018
• Est. Priority Date: 12/14/2016
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: KIM, Taehyoung, KWAK, Yongjun, KIM, Donghan, LEE, Juho, KIM, Youngbum, CHOI, Seunghoon
• Granted Patent: US 10,462,777 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 1/0039 other detection of signalling, e.g. detection of TFCI explicit signalling H04L1/0046, H04L27/0012 and H04L25/0262 take precedence
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 52/0229 where the received signal is a wanted signal
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

The present disclosure relates to a communication method and a system for converging a 5th-generation (5G) communication system for supporting higher data rates beyond a 4th-generation (4G) system with a technology for Internet of Things (IoT) is provided. The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. A decoding method for a terminal is provided. The method includes receiving a downlink control channel, receiving a reference signal in respective physical resource block (PRB) pairs, performing a correlation operation between a first sequence for the received reference signal and a second sequence for a predetermined reference signal for decoding the downlink control channel, and performing decoding of a search space for the downlink control channel in the PRB pair determined based on a result of the correlation operation.

Claims

1. A decoding method by a user equipment (UE), the method comprising:

receiving a downlink control channel;

receiving a reference signal in respective physical resource block (PRB) pairs;

performing a correlation operation between a first sequence for the received reference signal and a second sequence for a predetermined reference signal for decoding the downlink control channel; and

performing decoding of a search space for the downlink control channel in the PRB pair determined based on a result of the correlation operation performing.

2. The method of claim 1, wherein the second sequence is related to a UE-specific sequence configured through higher layer signaling.

3. The method of claim 1, wherein the reference signal for decoding the downlink control channel has a same pattern as that of a reference signal for decoding data transmitted from a base station.

4. The method of claim 1, wherein the performing of the decoding comprises:

comparing a correlation value in accordance with the correlation operation with a first threshold value in each of the PRB pairs; and

performing blind decoding for the search space existing in a first PRB pair if the correlation value in the first PRB pair is greater than the first threshold value in accordance with the result of the comparison.

5. The method of claim 4, wherein the performing of the decoding further comprises:

reducing the first threshold value for a predetermined value, if the correlation value in a second PRB pair is equal to or less than the first threshold value in accordance with the result of the comparison;

comparing the correlation value in the second PRB pair with the reduced first threshold value if the reduced first threshold value is greater than the minimum threshold value; and

performing the blind decoding for the search space existing in the second PRB pair if the correlation value is greater than the reduced first threshold value in accordance with the result of the comparison.

6. The method of claim 4, further comprising:

measuring a channel state of a downlink;

comparing a state value in accordance with the result of the measurement with a second threshold value; and

configuring the first threshold value in accordance with the result of the comparison.

7. The method of claim 4, further comprising:

identifying a battery state of the terminal;

comparing a residual battery amount in accordance with the result of the identification with a third threshold value; and

configuring the first threshold value in accordance with the result of the comparison.

8. The method of claim 1, wherein the performing of the correlation operation comprises:

generating a PRB pair set by bundling the PRB pairs; and

performing a correlation operation between the first sequence for the received reference signal and the second sequence in the PRB pair set.

9. The method of claim 1, wherein the reference signal is a demodulation reference signal (DMRS).

10. The method of claim 1, wherein the downlink control channel is an enhanced physical downlink control channel (EPDCCH).

11. A user equipment (UE) for performing decoding, the UE comprising:

a transceiver configured to transmit and receive signals; and

at least one processor coupled with the transceiver and configured to;

receive a downlink control channel,

receive a reference signal in respective physical resource block (PRB) pairs,

perform a correlation operation between a first sequence for the received reference signal and a second sequence for a predetermined reference signal for decoding the downlink control channel, and

perform decoding of a search space for the downlink control channel in the PRB pair determined based on a result of the correlation operation.

12. The UE of claim 11, wherein the second sequence is related to a UE-specific sequence configured through higher layer signaling.

13. The UE of claim 11, wherein the reference signal for decoding the downlink control channel has a same pattern as that of a reference signal for decoding data transmitted from a base station.

14. The UE of claim 11, wherein the at least one processor is further configured to:

compare a correlation value in accordance with the correlation operation with a first threshold value in each of the PRB pairs, and

perform blind decoding for the search space existing in a first PRB pair if the correlation value in the first PRB pair is greater than the first threshold value in accordance with the result of the comparison.

15. The UE of claim 14, wherein the at least one processor is further configured to:

reduce the first threshold value for a predetermined value if the correlation value in a second PRB pair is equal to or less than the first threshold value in accordance with the result of the comparison,

compare the correlation value in the second PRB pair with the reduced first threshold value if the reduced first threshold value is greater than the minimum threshold value, and

perform the blind decoding for the search space existing in the second PRB pair if the correlation value is greater than the reduced first threshold value in accordance with the result of the comparison.

16. The UE of claim 14, wherein the at least one processor is further configured to:

measure a channel state of a downlink,

compare a state value in accordance with the result of the measurement with a second threshold value, and

configure the first threshold value in accordance with the result of the comparison.

17. The UE of claim 14, wherein the at least one processor is further configured to:

identify a battery state of the terminal,

compare a residual battery amount in accordance with the result of the confirmation with a third threshold value, and

configure the first threshold value in accordance with the result of the comparison.

18. The UE of claim 11, wherein the at least one processor is further configured to:

generate a PRB pair set by bundling the PRB pairs, and

perform a correlation operation between the first sequence for the received reference signal and the second sequence in the PRB pair set.

19. The UE of claim 11, wherein the reference signal is a demodulation reference signal (DMRS).

20. The UE of claim 11, wherein the downlink control channel is an enhanced physical downlink control channel (EPDCCH).