METHOD AND APPARATUS FOR DOWNLINK COMMUNICATION IN COMMUNICATION SYSTEM

• US 20190253220A1
• Filed: 01/31/2019
• Published: 08/15/2019
• Est. Priority Date: 02/14/2018
• Status: Active Grant

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: KIM, Ji Hyung
• Granted Patent: US 10,999,036 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0695 using beam selection
• CPC Class Codes: H04B 7/088 using beam selection
• CPC Class Codes: H04J 11/0079 Acquisition of downlink reference signals, e.g. detection of cell-ID
• CPC Class Codes: H04J 13/0003 Code application, i.e. aspects relating to how codes are applied to form multiplexed channels
• CPC Class Codes: H04J 2011/0006 with CDM/CDMA
• CPC Class Codes: H04L 1/1832 Details of sliding window management
• CPC Class Codes: H04L 5/00 Arrangements affording multiple use of the transmission path
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 16/28 using beam steering
• CPC Class Codes: H04W 72/046 the resource being in the space domain, e.g. beams
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states

Abstract

An operation method of a base station in a communication system includes transmitting, to a terminal, a radio resource control (RRC) message including transmission configuration information (TCI)-state configuration information including information indicating a starting beam index and an ending beam index and reference signal related information; transmitting, to the terminal, a first downlink control information (DCI) including a first TCI indicating the starting beam index and first resource allocation information; and transmitting, to the terminal, a first physical downlink shared channel (PDSCH) through a resource indicated by the first resource allocation information by using a starting beam indicated by the first TCI.

Claims

1. An operation method of a base station in a communication system, the operation method comprising:

transmitting, to a terminal, a radio resource control (RRC) message including transmission configuration information (TCI)-state configuration information including information indicating a starting beam index and an ending beam index and reference signal related information;

transmitting, to the terminal, a first downlink control information (DCI) including a first TCI indicating the starting beam index and first resource allocation information; and

transmitting, to the terminal, a first physical downlink shared channel (PDSCH) through a resource indicated by the first resource allocation information by using a starting beam indicated by the first TCI.

2. The operation method according to claim 1, further comprising:

transmitting, to the terminal, a second DCI including second resource allocation information; and

transmitting, to the terminal, a second PDSCH through a resource indicated by the second resource allocation information by using a beam #n determined among the starting beam and the ending beam according to a preconfigured rule.

3. The operation method according to claim 1, further comprising:

transmitting, to the terminal, a third DCI including a second TCI and third resource allocation information; and

transmitting, to the terminal, a third PDSCH through a resource indicated by the third resource allocation information by using a beam estimated based on the second TCI,

wherein the second TCI indicates the reference signal related information instead of the starting beam index.

4. The operation method according to claim 1, wherein the RRC message further includes a TCI update indicator indicating that an implicit TCI update is performed.

5. The operation method according to claim 1, wherein the RRC message further includes a beam interval indicating an interval at which a beam is updated, wherein a beam used for communications between the base station and the terminal is determined among the starting beam to the ending beam according to the interval indicated by the beam interval.

6. The operation method according to claim 1, wherein the RRC message further includes beam change information indicating a time required for a change from a current beam to a next beam, wherein a beam used for communications between the base station and the terminal is changed to another beam after a lapse of the time indicated by the beam change information.

7. The operation method according to claim 1, wherein the RRC message further includes a TCI update type indicating a beam update scheme, the ending beam is used for communications between the base station and the terminal before receiving a second TCI when the RRC message indicates a TCI update type 1 and a beam used for communications between the base station and the terminal is updated to the ending beam, and the ending beam is updated to the starting beam in a cyclic shift manner when the RRC message indicates a TCI update type 2 and a beam used for communications between the base station and the terminal is updated to the ending beam.

8. The operation method according to claim 1, wherein the RRC message further includes a demodulation reference signal (DM-RS) interval indicating an allocation interval of DM-RSs, and the DM-RSs are transmitted to the terminal through the first PDSCH according to the allocation interval indicated by the DM-RS interval.

9. The operation method according to claim 1, wherein the RRC message further includes a code division multiplexing (CDM) separation parameter indicating a number of CDM groups allocated to one resource block (RB), and demodulation reference signals (DM-RSs) belonging to the CDM group are transmitted to the terminal through the first PDSCH according to an allocation scheme determined based on information indicated by the CDM separation parameter.

10. The operation method according to claim 1, wherein the RRC message further includes a code division multiplexing (CDM) interval indicating an allocation interval of demodulation reference signals (DM-RSs) belonging to a same CDM group, and the DM-RSs are transmitted to the terminal through the first PDSCH according to the allocation interval indicated by the CDM interval.

11. An operation method of a terminal in a communication system, the operation method comprising:

receiving, from a base station, a radio resource control (RRC) message including transmission configuration information (TCI)-state configuration information including information indicating a starting beam index and an ending beam index and reference signal related information;

receiving, from the base station, a first downlink control information (DCI) including a first TCI indicating the starting beam index and first resource allocation information to the terminal; and

receiving, from the base station, a first physical downlink shared channel (PDSCH) through a resource indicated by the first resource allocation information by using a starting beam indicated by the first TCI.

12. The operation method according to claim 11, further comprising:

receiving, from the base station, a second DCI including second resource allocation information; and

receiving, from the base station, a second PDSCH through a resource indicated by the second resource allocation information by using a beam #n determined among the starting beam and the ending beam according to a preconfigured rule.

13. The operation method according to claim 11, further comprising:

receiving, from the base station, a third DCI including a second TCI and third resource allocation information; and

receiving, from the base station, a third PDSCH through a resource indicated by the third resource allocation information by using a beam estimated based on the second TCI,

wherein the second TCI indicates the reference signal related information instead of the starting beam index.

14. The operation method according to claim 11, wherein the RRC message further includes a TCI update indicator indicating that an implicit TCI update is performed.

15. The operation method according to claim 11, wherein the RRC message further includes a beam interval indicating an interval at which a beam is updated, wherein a beam used for communications between the base station and the terminal is determined among the starting beam to the ending beam according to the interval indicated by the beam interval.

16. The operation method according to claim 11, wherein the RRC message further includes beam change information indicating a time required for a change from a current beam to a next beam, wherein a beam used for communications between the base station and the terminal is changed to another beam after a lapse of the time indicated by the beam change information.

17. The operation method according to claim 11, wherein the RRC message further includes a TCI update type indicating a beam update scheme, the ending beam is used for communications between the base station and the terminal before receiving a second TCI when the RRC message indicates a TCI update type 1 and a beam used for communications between the base station and the terminal is updated to the ending beam, and the ending beam is updated to the starting beam in a cyclic shift manner when the RRC message indicates a TCI update type 2 and a beam used for communications between the base station and the terminal is updated to the ending beam.

18. The operation method according to claim 11, wherein, when the RRC message further includes a demodulation reference signal (DM-RS) interval indicating an allocation interval of DM-RSs in a frequency domain, the receiving a first PDSCH comprises:

receiving the DM-RSs through the first PDSCH according to the allocation interval indicated by the DM-RS interval; and

demodulating downlink data received through the first PDSCH based on the DM-RSs.

19. The operation method according to claim 11, wherein, when the RRC message further includes a code division multiplexing (CDM) separation parameter indicating a number of CDM groups allocated to one resource block (RB), the receiving a first PDSCH comprises:

receiving demodulation reference signals (DM-RSs) belonging to the CDM group through the first PDSCH according to an allocation scheme determined based on information indicated by the CDM separation parameter; and

demodulating downlink data received through the first PDSCH based on the DM-RSs.

20. The operation method according to claim 11, wherein, when the RRC message further includes a code division multiplexing (CDM) interval indicating an allocation interval of demodulation reference signals (DM-RSs) belonging to a same CDM group, the receiving a first PDSCH comprises:

receiving the DM-RSs through the first PDSCH according to the allocation interval indicated by the CDM interval; and

demodulating downlink data received through the first PDSCH based on the DM-RSs.