US-12621866-B2 - Method and device for SSB transmission/reception in wireless communication system

Abstract

The present disclosure relates to a 5G or 6G communication system for supporting a data transmission rate higher than that of a 4G communication system, such as LTE. A transmission or reception method of a terminal in a wireless communication system may comprise the steps of receiving a synchronization signal block (SSB) from a base station on the basis of blind detection, on the basis of the received SSB, identifying information on an SSB group to which the SSB belongs, wherein the SSB group is related to a first frequency domain, on the basis of the information on the SSB group, identifying a second frequency domain corresponding to at least one other SSB group, and receiving at least one SSB belonging to the at least one other SSB group from the base station on the basis of the second frequency domain.

Inventors

• Hanjin KIM
• Seunghyun Lee
• Hyojin Lee
• Yosub PARK
• Jaehyun Lee
• Juho Lee

Assignees

• SAMSUNG ELECTRONICS CO., LTD.

Dates

Publication Date

20260505

Application Date

20211206

Priority Date

20201214

Claims (15)

1. 1 . A method performed by a user equipment (UE) in a wireless communication system, the method comprising: receiving, from a base station, a synchronization signal block (SSB) included in frequency division multiplexed SSBs based on blind detection; identifying that the SSB belongs to a first SSB group corresponding to a first frequency domain, based on information on an SSB group, wherein the information on the SSB group is included in the SSB and indicates a location of a frequency domain associated with the frequency division multiplexed SSBs; determining a second frequency domain corresponding to a second SSB group based on the information on the SSB group; and receiving, from the base station, an SSB belonging to the second SSB group based on the second frequency domain.
2. 2 . The method of claim 1 , wherein the information on the SSB group is included in at least one of a primary synchronization sequence (PSS), a secondary synchronization sequence (SSS), or a physical broadcast channel (PBCH) of the SSB belonging to the first SSB group.
3. 3 . The method of claim 1 , wherein the information on the SSB group includes an SSB group index to which an SSB belongs.
4. 4 . The method of claim 1 , wherein the information on the SSB group includes information on a total number of SSB groups and an SSB group index to which an SSB belongs.
5. 5 . The method of claim 1 , further comprising: transmitting, to the base station, a random access channel (RACH) preamble on an RACH occasion corresponding to an SSB selected based on a reference signal received power (RSRP) of SSBs belonging to the first SSB group and the second SSB group.
6. 6 . A method performed by a base station in a wireless communication system, the method comprising: determining a synchronization signal block (SSB) group to which each of SSBs belongs, wherein each SSB group is related to a different frequency domain; generating frequency division multiplexed SSBs based on a resource mapping of the SSBs; and transmitting, to a user equipment (UE), the frequency division multiplexed SSBs, wherein information on the SSB group is included in an SSB of the frequency division multiplexed SSBs and indicates a location of a frequency domain associated with the frequency division multiplexed SSBs, wherein a first frequency domain corresponding to a first SSB group including the SSB and a second frequency domain corresponding to a second SSB group including another SSB is determined by the UE based on the reception of the SSB.
7. 7 . The method of claim 6 , wherein the information on the SSB group is included in at least one of a primary synchronization sequence (PSS), a secondary synchronization sequence (SSS), or a physical broadcast channel (PBCH) of the SSB belonging to the first SSB group.
8. 8 . The method of claim 6 , wherein the information on the SSB group includes information on a total number of SSB groups and an SSB group index to which an SSB belongs.
9. 9 . The method of claim 6 , further comprising: receiving, from the UE, a random access channel (RACH) preamble on an RACH occasion corresponding to an SSB selected based on a reference signal received power (RSRP) of SSBs belonging to the first SSB group and the second SSB group.
10. 10 . A user equipment (UE) in a wireless communication system, the UE comprising: a transceiver; and a controller coupled to the transceiver and configured to: receive, from a base station, a synchronization signal block (SSB) included in frequency division multiplexed SSBs based on blind detection, identify that the SSB belongs to a first SSB group corresponding to a first frequency domain, based on information on an SSB group, wherein the information on the SSB group is included in the SSB and indicates a location of a frequency domain associated with the frequency division multiplexed SSBs, determine a second frequency domain corresponding to a second SSB group based on the information on the SSB group, and receive, from the base station, an SSB belonging to the second SSB group based on the second frequency domain.
11. 11 . The UE of claim 10 , wherein the information on the SSB group is included in at least one of a primary synchronization sequence (PSS), a secondary synchronization sequence (SSS), or a physical broadcast channel (PBCH) of the SSB belonging to the first SSB group, and wherein the information on the SSB group includes information on a total number of SSB groups and an SSB group index to which an SSB belongs.
12. 12 . The UE of claim 10 , wherein the controller is further configured to transmit, to the base station, a random access channel (RACH) preamble on an RACH occasion corresponding to an SSB selected based on a reference signal received power (RSRP) of SSBs belonging to the first SSB group and the second SSB group.
13. 13 . A base station in a wireless communication system, the base station comprising: a transceiver; and a controller coupled to the transceiver and configured to: determine a synchronization signal block (SSB) group to which each of SSBs belongs, wherein each SSB group is related to a different frequency domain, generate frequency division multiplexed SSBs based on a resource mapping of the SSBs, and transmit, to a user equipment (UE), the frequency division multiplexed SSBs, wherein information on the SSB group is included in an SSB of the frequency division multiplexed SSBs and indicates a location of a frequency domain associated with the frequency division multiplexed SSBs, wherein a first frequency domain corresponding to a first SSB group including the SSB and a second frequency domain corresponding to a second SSB group including another SSB is determined by the UE based on the reception of the SSB.
14. 14 . The base station of claim 13 , wherein the information on the SSB group is included in at least one of a primary synchronization sequence (PSS), a secondary synchronization sequence (SSS), or a physical broadcast channel (PBCH) of the SSB belonging to the first SSB group, and wherein the information on the SSB group includes information on a total number of SSB groups and an SSB group index to which an SSB belongs.
15. 15 . The base station of claim 13 , wherein the controller is further configured to receive, from the UE, a random access channel (RACH) preamble on an RACH occasion corresponding to an SSB selected based on a reference signal received power (RSRP) of SSBs belonging to the first SSB group and the second SSB group.

Description

TECHNICAL FIELD The disclosure relates to a method and a device for SSB transmission and reception to reduce a beam sweeping resource overhead in a wireless communication system. BACKGROUND ART In looking back on the development processes with the repetition of the wireless communication generations, technologies for mainly human-targeted services, such as voice, multimedia, and data, have been developed. Connected devices, which are explosively on the rise after commercialization of the 5th generation (5G) communication system, have been expected to be connected to a communication network. Examples of things connected to the network may be vehicles, robots, drones, home appliances, displays, smart sensors installed in various kinds of infrastructures, construction machines, and factory equipment. Mobile devices are expected to be evolved to various form factors, such as augmented reality glasses, virtual reality headsets, and hologram devices. In the 6th generation (6G), in order to provide various services through connection of hundreds of billions of devices and things with one another, efforts for developing an improved 6G communication system have been made. For this reason, the 6G communication system is called a “beyond 5G system”. In the 6G communication system that is expected to be realized around 2030, the maximum transmission speed is tera (i.e., 1,000 giga) bps, and wireless latency is 100 microseconds (μ sec). That is, as compared with the 5G communication system, the transmission speed in the 6G communication system becomes 50 times faster, and the wireless latency is reduced to 1/10. In order to accomplish such a high data transmission speed and ultra-low latency, implementation of the 6G communication system in terahertz bands (e.g., 95 gigahertz (95 GHz) to 3 terahertz (3 THz) bands) is being considered. In the terahertz bands, due to more severe path loss and atmospheric absorption phenomena than those in the millimeter wave (mmWave) bands introduced in the 5G, the importance of a technology to secure a signal reaching distance, that is, the coverage, is expected to become grower. As a primary technology to secure the coverage, it is required to develop a radio frequency (RF) element, antenna, more superior new waveform than the waveform of the orthogonal frequency division multiplexing (OFDM) in the coverage aspect, beamforming and massive multiple-input multiple-output (massive MIMO), full dimensional MIMO (FD-MIMO), array antenna, and multi-antenna transmission technology, such as large scale antenna technique. In addition, in order to improve the coverage of the terahertz band signals, new techniques, such as metamaterial-based lens and antenna, high-level spatial multiplexing technology using orbital angular momentum (OAM), and reconfigurable intelligent surface (RIS), are being discussed. In addition, for frequency efficiency enhancement and system network improvement, in the 6G communication system, developments are under way in a full duplex technology in which an uplink and a downlink simultaneously utilize the same frequency resource at the same time, a network technology to integrally utilize a satellite and high-altitude platform station (HAPS), a network structure innovation technology to support a mobile base station and to enable network operation optimization and automation, a dynamic spectrum sharing technology through collision avoidance based on spectrum usage prediction, an AI-based communication technology to realize system optimization by utilizing artificial intelligence (AI) from a design stage and internalizing end-to-end AI support function, and a next-generation distributed computing technology to realize services having complexity that exceeds the limit of the UE operation capability by utilizing ultrahigh performance communication and computing resources (mobile edge computing (MEC) or cloud). In addition, attempts are continuing to further strengthen connectivity between devices through designing of a new protocol to be used in the 6G communication system, implementation of hardware-based security environment, development of a mechanism for safe utilization of data, and technical development of a privacy maintaining method, to further optimize the network, to accelerate software of network entities, and to increase openness of the wireless communication. By such researches and developments of the 6G communication system, it is expected that the next hyper-connected experience is possible through hyper-connectivity of the 6G communication system including not only connection between things but also connection between a human and a thing in all. Specifically, it is expected that services, such as truly immersive extended reality (XR), high-fidelity mobile hologram, and digital replica, can be provided through the 6G communication system. Further, since services, such as remote surgery, industrial automation, and emergency response through increasing security an