Communication method and device in beamforming-based wireless communication system supporting plurality of frequency bands

Patent metadata

Field	Value
Publication number	US-12413276-B2
Application number	US-202218262147-A
Country	US
Kind code	B2
Filing date	Jan 12, 2022
Priority date	Jan 25, 2021
Publication date	Sep 9, 2025
Grant date	Sep 9, 2025

Abstract

The present disclosure relates to a communication method and device in a beamforming-based wireless communication system supporting a plurality of frequency bands, the communication method for a terminal, according to an embodiment of the present disclosure, comprising the steps of: performing a beam search using a plurality of first reception beams in a first frequency band and receiving a synchronization signal block (SSB) comprising first information about a base station provided at the same location; performing, on the basis of the first information, a beam search for a plurality of second reception beams in a second frequency band belonging to a subset of the first reception beams that received the SSB in the first frequency band; and communicating with the base station in the second frequency band by selecting an optimal pair of transmission and reception beams as result of the beam search for the plurality of second reception beams.

First claim

The invention claimed is:

1. A communication method of a base station (BS) in a beamforming-based wireless communication system supporting a plurality of frequency bands, the communication method comprising:
transmitting each of synchronization signal blocks (SSBs) including first information about a BS installed at a co-location through a plurality of first transmission beams having different directions in a first frequency band; and
performing, using a transmission beam in a second frequency band, communication with a user equipment (UE) for which an optimal transmission/reception beam pair in the second frequency band having a higher frequency than the first frequency band is determined based on the first information.

2. The communication method of claim 1 , wherein the first information about the BS installed at the co-location indicates whether a subset beam search method enabling a beam search in the second frequency band based on a result of a beam search in the first frequency band is supported.

3. The communication method of claim 1 , wherein the first information further indicates a pair of first and second BSs forming the first and second transmission beams in the first and second frequency bands, respectively,
wherein the first BS is a BS of a millimeter wave (mmW) band, and the second BS is a BS of a terahertz (THz) band, and
wherein the first and second BSs are different BSs included in the BS installed at the co-location or geographically close to each other.

4. The communication method of claim 1 , further comprising transmitting second information including a threshold for a signal strength of a serving cell, used to determine whether to release a beam search operation based on the first information in the second frequency band.

5. The communication method of claim 4 , further comprising transmitting third information indicating a measurement gap differentiated according to whether the beam search operation based on the first information in the second frequency band is supported,
wherein a setting of at least one of a measurement length or a measurement period of the measurement gap is adjusted for a cell of the BS installed at the co-location, which supports the beam search operation based on the first information in the second frequency band, when the measurement length is adjusted, the measurement length is adjusted to be relatively short, and when the measurement period is adjusted, the measurement period is adjusted to be relatively long.

6. A base station (BS) in a beamforming-based wireless communication system supporting a plurality of frequency bands, the BS comprising:
a transceiver; and
a processor configured to transmit each of synchronization signal blocks (SSBs) including first information about a BS installed at a co-location through a plurality of first transmission beams having different directions in a first frequency band, through the transceiver, and perform, using a transmission beam in a second frequency band through the transceiver, communication with a user equipment (UE) for which an optimal transmission/reception beam pair in the second frequency band having a higher frequency than the first frequency band is determined based on the first information.

7. The BS of claim 6 , wherein the first information about the BS installed at the co-location indicates whether a subset beam search method enabling a beam search in the second frequency band based on a result of a beam search in the first frequency band is supported.

8. A communication method of a user equipment (UE) in a beamforming-based wireless communication system supporting a plurality of frequency bands, the communication method comprising:
receiving a synchronization signal block (SSB) including first information about a base station (BS) installed at a co-location by performing a beam search using a plurality of first reception beams in a first frequency band;
performing a beam search on a plurality of second reception beams in a second frequency band belonging to a subset of a first reception beam through which the SSB is received in the first frequency band, based on the first information; and
communicating with the BS in the second frequency band by selecting an optimal transmission/reception beam pair as a result of the beam search on the plurality of second reception beams.

9. The communication method of claim 8 , further comprising identifying whether a subset beam search method enabling a beam search in a second frequency band having a higher frequency than the first frequency band is supported, based on the first information,
wherein each of the plurality of first reception beams in the first frequency band includes a plurality of second reception beams in the second frequency band as a subset, and
wherein the first information indicates whether the subset beam search method enabling the beam search in the second frequency band based on a result of the beam search in the first frequency band is supported.

10. The communication method of claim 8 , wherein the first information further indicates a pair of first and second BSs forming first and second transmission beams in the first and second frequency bands, respectively,
wherein the first BS is a BS of a millimeter wave (mmW) band, and the second BS is a BS of a terahertz (THz) band, and
wherein the first and second BSs are different BSs included in the BS installed at the co-location or geographically close to each other.

11. The communication method of claim 8 , further comprising receiving, from the BS, second information including a threshold for a signal strength of a serving cell, used to determine whether to release a beam search operation based on the first information in the second frequency band.

12. The communication method of claim 11 , further comprising receiving, from the BS, third information indicating a measurement gap differentiated according to whether the beam search operation based on the first information in the second frequency band is supported,
wherein a setting of at least one of a measurement length or a measurement period of the measurement gap is adjusted for a cell of the BS installed at the co-location, which supports the beam search operation based on the first information in the second frequency band, when the measurement length is adjusted, the measurement length is adjusted to be relatively short, and when the measurement period is adjusted, the measurement period is adjusted to be relatively long.

13. A user equipment (UE) in a beamforming-based wireless communication system supporting a plurality of frequency bands, the UE comprising:
a transceiver; and
a processor configured to receive a synchronization signal block (SSB) including first information about a base station (BS) installed at a co-location by perform a beam search using a plurality of first reception beams in a first frequency band, through the transceiver, perform a beam search on a plurality of second reception beams in a second frequency band belonging to a subset of a first reception beam through which the SSB is received in the first frequency band, based on the first information, and communicate with the BS in the second frequency band by selecting an optimal transmission/reception beam pair as a result of the beam search on the plurality of second reception beams, through the transceiver.

14. The UE of claim 13 , wherein the processor is configured to identify whether a subset beam search method enabling a beam search in a second frequency band having a higher frequency than the first frequency band is supported, based on the first information,
wherein each of t

Assignees

• Samsung Electronics Co Ltd

Inventors

• Lee Sangho
• JUNG Byounghoon
• Jung Jungsoo
• Cha Jiyoung
• Choi Jinho

Classifications

• H04B7/088

  using beam selection · CPC title

• H04B7/0695

  using beam selection · CPC title

• H04W36/085

  involving beams of access points · CPC title

• H04W48/08

  Access restriction or access information delivery, e.g. discovery data delivery (signalling during connection H04W76/00) · CPC title

• H04W24/08

  Testing, {supervising or monitoring} using real traffic · CPC title