KR-20260066627-A - BEAM LAYOUT DESIGN METHOD AND APPARATUS

KR20260066627AKR 20260066627 AKR20260066627 AKR 20260066627AKR-20260066627-A

Abstract

A method of a first satellite comprises the steps of: receiving a measurement report from a terminal; transmitting first information for setting a beam layout based on the measurement report to a core network entity; receiving type information of a beam layout determined based on the first information from the core network entity; the type information indicating one of a target service area specific beam layout or a default beam layout; and transmitting second information to the terminal for handover between beams formed by the beam layout.

Inventors

엄차현
황유선
강숙양
박주한
배명산
배형득
신재승
신재욱
오성민
정광렬

Assignees

한국전자통신연구원

Dates

Publication Date: 20260512
Application Date: 20251028
Priority Date: 20241104

Claims (20)

As a method of the first satellite, A step of receiving a measurement report from a terminal; A step of transmitting first information for beam layout setting to a core network entity based on the above measurement report; A step of receiving type information of a beam layout determined based on the first information from the core network entity, wherein the type information indicates one of a target service area specific beam layout or a default beam layout; and A step comprising transmitting second information for handover between beams formed by the beam layout to the terminal, Method of the first satellite.
In claim 1, The second information includes at least one of a reference position for each of the beams formed based on the beam layout or a distance threshold for performing a beam-level handover of the terminal. Method of the first satellite.
In claim 1, The method further includes the step of receiving a terminal-specific parameter report from the terminal after receiving the above measurement report, and The above terminal-specific parameter report includes at least one of the location of the terminal, average traffic generated in the area to which the terminal belongs, climate information of the area, or topographic information of the area, and the measurement report includes the quality of a signal received by the terminal from the first satellite, and the first information is further based on the terminal-specific parameter report. Method of the first satellite.
In claim 1, The method further comprises the step of receiving a set of parameters defining the target service area-specific beam layout from the core network entity based on the above type information indicating the target service area-specific beam layout. Method of the first satellite.
In claim 4, The above parameter set includes at least one of the transmission power of each beam formed based on the target service area-specific beam layout or the direction information of each beam. Method of the first satellite.
In claim 1, The method further includes the step of transmitting a beam layout switching flag to the terminal, which indicates whether to switch the beam layout or at least one of the method of switching the beam layout. Method of the first satellite.
As a method of the core network entity, A step of receiving first information for beam layout setting from a first satellite; A step of performing a beam layout setting based on the above first information; A step of determining the validity of a target service area-specific beam layout generated through the above beam layout settings; and The method includes the step of transmitting type information of a beam layout to be used by the first satellite based on the above validity, The above type information indicates one of the target service area specific beam layout or the default beam layout, Method of core network entity.
In claim 7, The method further comprises the step of transmitting a set of parameters defining the target service area specific beam layout to the first satellite based on the determination that the target service area specific beam layout is valid. Method of core network entity.
In claim 7, The method further includes the step of transmitting type information of a beam layout to a second satellite connected to the terminal through satellite switching performed by the terminal that generated the first information, based on the determination that the beam layout specific to the target service area is invalid. Method of core network entity.
In claim 9, The method further comprises the step of transmitting a beam layout switching flag to the second satellite, which indicates whether to switch the beam layout or at least one of the method of switching the beam layout. Method of core network entity.
In claim 8, The above parameter set includes at least one of the transmission power of each beam formed based on the target service area-specific beam layout or the direction information of each beam. Method of core network entity.
In claim 7, The first information comprises at least one of a measurement report received by the first satellite from a terminal connected to the first satellite or a terminal-specific parameter report received by the first satellite from the terminal. Method of core network entity.
In claim 12, The terminal-specific parameter report includes at least one of the location of the terminal, average traffic generated in the area to which the terminal belongs, climate information of the area to which the terminal belongs, or topographic information of the area to which the terminal belongs, and the measurement report includes the quality of the signal received by the terminal from the first satellite. Method of core network entity.
In claim 7, The step of performing the above beam layout setting is, The method includes the step of determining the transmission power of each beam based on the beam layout specific to the target service area, and The above transmission power is determined through integration over an achievable transmission rate function performed in a first region located on the UV plane, wherein the first region corresponds to a target region associated with the target service area specific beam layout, Method of core network entity.
In claim 7, The step of performing the above beam layout setting is, A step of determining path losses for the path between the first satellite and points belonging to the target area associated with the target service area specific beam layout; and A step comprising determining the transmission power of each beam corresponding to the points based on the result of comparing the path losses above. Method of core network entity.
In claim 7, The method further includes the step of receiving received signal quality information generated by a terminal connected to the first satellite from the first satellite after performing the beam layout setting above. The step of determining the validity of the above is, A step of predicting the quality value of a signal received by the terminal by beams based on the beam layout specific to the target service area; and A step of determining the validity based on a comparison between a quality value indicated by the received signal quality information and the predicted quality value, Method of core network entity.
As a method of terminal, A step of transmitting a measurement report to the first satellite; A step of transmitting a terminal-specific parameter report to the first satellite; and The method comprises the step of receiving second information associated with a beam layout determined based on at least one of the measurement report or the terminal-specific parameter report from the first satellite, wherein the second information is information for handover between beams formed by the first satellite based on the beam layout. Method of the terminal.
In claim 17, The second information includes at least one of a reference position for each of the beams formed based on the beam layout or a distance threshold for performing a beam-level handover of the terminal. Method of the terminal.
In claim 17, The above terminal-specific parameter report includes at least one of the location of the terminal, average traffic generated in the area to which the terminal belongs, climate information of the area, or topographic information of the area, and the measurement report includes the quality of the signal received by the terminal from the first satellite. Method of the terminal.
In claim 17, The method further comprises the step of receiving a beam layout switching flag from the first satellite indicating whether to switch the beam layout or at least one of the method of switching the beam layout. Method of the terminal.

Description

Beam Layout Design Method and Apparatus The present invention relates to an improved communication technology, and more specifically, to a multi-beam layout design technology in a non-terrestrial network (NTN). Communication networks (e.g., 5G communication networks, 6G communication networks, etc.) are being developed to provide communication services that are improved over existing communication networks (e.g., LTE (long term evolution), LTEA (advanced), etc.). 5G communication networks (e.g., NR (new radio) communication networks) can support frequency bands above 6 GHz as well as frequency bands below 6 GHz. In other words, 5G communication networks can support the FR1 band and/or FR2 band. 5G communication networks can support a wider variety of communication services and scenarios compared to LTE communication networks. For example, usage scenarios for 5G communication networks may include eMBB (enhanced Mobile BroadBand), URLLC (Ultra Reliable Low Latency Communication), mMTC (massive Machine Type Communication), etc. Beamforming utilizing multiple beams can be used in non-terrestrial networks (NTN). Beamforming in NTN may be operated differently from beamforming in terrestrial networks (TN) by considering the characteristics of the satellite. In NTN, beams can cover specific areas rather than terminals. Therefore, it may be necessary to design a beam layout that can improve the performance of NTN communication services based on the terrain, climate, and average traffic of the target service area. FIG. 1 is a conceptual diagram illustrating embodiments of a non-ground network. FIG. 2 is a conceptual diagram illustrating embodiments of a non-ground network. FIG. 3 is a block diagram illustrating embodiments of entities constituting a non-terrestrial network. FIG. 4a is a conceptual diagram illustrating embodiments of the relationship between a satellite beam and a PCI (physical cell identifier). FIG. 4b is a conceptual diagram illustrating embodiments of the relationship between a satellite beam and a physical cell identifier (PCI). FIG. 5a is a conceptual diagram illustrating embodiments of a beam layout. FIG. 5b is a conceptual diagram illustrating embodiments of a beam layout. Figure 6 is a flowchart illustrating embodiments of the beam layout design procedure. FIG. 7 is a flowchart illustrating embodiments of the procedure for determining the validity of a beam layout. FIG. 8 is a conceptual diagram illustrating embodiments of earth-moving beams. FIG. 9a is a flowchart illustrating embodiments of a beam layout switching procedure. FIG. 9b is a flowchart illustrating embodiments of a beam layout switching procedure. FIG. 9c is a flowchart illustrating embodiments of a beam layout switching procedure. FIG. 10 is a conceptual diagram illustrating embodiments of semi-circular fixed beams. FIG. 11a is a flowchart illustrating embodiments of a beam layout switching procedure. FIG. 11b is a flowchart illustrating embodiments of a beam layout switching procedure. FIG. 11c is a flowchart illustrating embodiments of a beam layout switching procedure. FIG. 11d is a flowchart illustrating embodiments of a beam layout switching procedure. The present disclosure is capable of various modifications and may have various embodiments, and specific embodiments are illustrated in the drawings and described in detail. However, this is not intended to limit the present disclosure to specific embodiments, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the present disclosure. Terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. Such terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present disclosure, the first component may be named the second component, and similarly, the second component may be named the first component. The term "and/or" includes a combination of a plurality of related described items or any of a plurality of related described items. In the present disclosure, “at least one of A and B” may mean “at least one of A or B” or “at least one of one or more combinations of A and B”. Additionally, in the present disclosure, “one or more of A and B” may mean “one or more of A or B” or “one or more combinations of A and B”. In the present disclosure, (re)transmission may mean “transmission,” “retransmission,” or “transmission and retransmission”; (re)setting may mean “setting,” “resetting,” or “setting and resetting”; (re)connection may mean “connection,” “reconnection,” or “connection and reconnection”; and (re)connection may mean “connection,” “reconnection,” or “connection and reconnection”. When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or conn