A method for cell-to-cell handover

Abstract

The present invention relates to a method (100) for conditional cell-to-cell handover which takes into account the signalling load and storm in non-terrestrial networks for integration of terrestrial networks and non-terrestrial networks.

Description

[0001] A METHOD FOR CELL-TO-CELL HANDOVER

[0002] Technical Field

[0003] The present invention relates to a method for conditional cell-to-cell handover which takes into account the signalling load and storm in non-terrestrial networks for integration of terrestrial networks and non-terrestrial networks.

[0004] Background of the Invention

[0005] In the state of the art, conditional handover (CHO) is used for terrestrial networks. However, due to the similar signal level in the middle and at the end of the cell encountered in non-terrestrial networks, it is not possible to use a CHO developed for normal terrestrial networks, for terrestrial networks. In addition, due to the fact that the cell sizes of non-terrestrial networks are very large compared to terrestrial networks, hundreds or thousands of users may want to switch between cells at the same time.

[0006] Therefore, considering the studies and the deficiencies included in the current technique, it is understood that there is need for a method for conditional cell-to- cell handover which enables to provide suggestions that will reduce the signalling load and storm created at the request of too many users at the same time since the coverage of non-terrestrial networks is too wide and which takes into account the signalling load and storm in non-terrestrial networks for integration of terrestrial networks and non-terrestrial networks.

[0007] The International patent document no. WO2022087118, an application in the state of the art, discloses cell-to-cell handovers of non-terrestrial networks (NTN). The said invention comprises a computer-readable storage medium that stores instructions to configure a UE (User Equipment) for group handover in a 5G NR network with non-terrestrial access and to cause the UE to perform operations comprising encoding a measurement report for transmission to a base station via a satellite node of the 5G NR network. RRC (Radio Resource Control) signaling broadcast in the 5G NR network in response to the measurement report is decoded. The RRC signaling originates from a base station and is received via a broadcast transmission of the satellite node. The RRC signaling includes configuration information for a conditional handover. An evaluation of one or more conditions specified by the configuration information is performed for the conditional handover. The conditional handover from a current cell to a new cell of the 5G NR network is performed based on the evaluation.

[0008] Summary of the Invention

[0009] An objective of the present invention is to realize a method for providing a conditional cell-to-cell handover by taking into account the signalling load and storm in 5G and advanced non-terrestrial networks.

[0010] Detailed Description of the Invention

[0011] “A Method for Cell-to-Cell Handover” realized to fulfil the objective of the present invention is shown in the figure attached, in which:

[0012] Figure l is a flowchart of the inventive method.

[0013] The components illustrated in the figure are individually numbered, where the numbers refer to the following:

[0014] 100. Method The inventive method (100) for providing a conditional cell-to-cell handover by taking into account the signalling load and storm in non-terrestrial networks comprises steps of controlling the location and service time information of users of a gNodeB station that provide service in a non-terrestrial network (101), examining the satellite (LEO, MEO, GEO) wherein the gNodeB station cell provide services and fixed or mobile cell types (102), controlling whether the conditional cell handover used for the non-terrestrial networks in accordance with the location and service time information will be performed (103), if it is determined that no additional information is included in the user equipment, implementing the conditional cell handover used for the terrestrial networks (104), in the event that the location and service time information is received from the user equipment, using the location and service time information for the conditional cell-to-cell handover (105), if LEO / MEO non-terrestrial networks use quasi earth fixed cell, prioritizing the time data (106), if GEO earth fixed cell is used, prioritizing the location information (107), prioritizing both location and time information for LEO / MEO mobile cells (108), sharing the secondary and the tertiary neighbours other than the first neighbour for the candidates of conditional cell handover in order to reduce the signalling load (109), sending the instruction of conditional cell handover as group based in the event that fixed and quasi earth fixed cells are used in order to reduce the signalling storm (110), implementing the conditional cell handover that comprises the location and time information and takes into account the signalling load and storm (111), if there is a user or user equipment that should make cell-to-cell handover, returning the step no. 101 in order to control the parameters again (112). Industrial applicability of the invention

[0015] In the inventive method (100), it is ensured to reduce the signalling load during cell- to-cell handover of 5G and advanced base stations gNodeBs using 3GPP standards and telephones that get service from them and to increase the success rate of cell handover.

[0016] Within these basic concepts; it is possible to develop a wide variety of embodiments of the inventive “Method for Cell-to-Cell Handover (1)”; the invention cannot be limited to examples disclosed herein and it is essentially according to claims.

Claims

CLAIMS A method (100) for providing a conditional cell-to-cell handover by taking into account the signalling load and storm in non-terrestrial networks; characterized by steps of controlling the location and service time information of users of a gNodeB station that provide service in a non-terrestrial network (101), examining the satellite (LEO, MEO, GEO) wherein the gNodeB station cell provide services and fixed or mobile cell types (102), controlling whether the conditional cell handover used for the nonterrestrial networks in accordance with the location and service time information will be performed (103), if it is determined that no additional information is included in the user equipment, implementing the conditional cell handover used for the terrestrial networks (104), in the event that the location and service time information is received from the user equipment, using the location and service time information for the conditional cell-to-cell handover (105), if LEO / MEO non-terrestrial networks use quasi earth fixed cell, prioritizing the time data (106), if GEO earth fixed cell is used, prioritizing the location information (107), prioritizing both location and time information for LEO / MEO mobile cells (108), sharing the secondary and the tertiary neighbours other than the first neighbour for the candidates of conditional cell handover in order to reduce the signalling load (109), sending the instruction of conditional cell handover as group based in the event that fixed and quasi earth fixed cells are used in order to reduce the signalling storm (110),implementing the conditional cell handover that comprises the location and time information and takes into account the signalling load and storm (111), if there is a user or user equipment that should make cell-to-cell handover, returning the step no. 101 in order to control the parameters again (112).

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