RU2771835C1 - Method and apparatus for controlling packet duplication accounting for two-system communication in a new generation mobile communication system - Google Patents

Abstract

FIELD: wireless communication.

SUBSTANCE: method includes receiving system information related to reselecting a cell for an adjacent cell from the base station whereto the terminal is attached, in case when the terminal supports a supplementary uplink (SUL), and the system information includes the first level minimum requirement reception information related to SUL, receiving the first value of the reception level when selecting a cell based on the first level minimum requirement reception information related to SUL, and reselecting a cell in favour of the new radio (NR) cell based on the first value of the reception level when selecting a cell.

EFFECT: provide packet control accounting for the architecture of two-system communication.

15 cl, 24 dwg, 1 tbl

Description

FIELD OF TECHNOLOGY TO WHICH THE INVENTION RELATES

[1] The invention relates to the management of duplication of packets, taking into account the architecture of two-system communication in a mobile communication system. In particular, the invention relates to cell reselection in a mobile communication system.

BACKGROUND OF THE INVENTION

[2] To meet the demand for wireless data traffic that has grown due to the deployment of the 4G communication system, efforts have been made to develop an advanced 5th generation (5G) or pre-5G communication system. Therefore, the 5G or pre-5G communication system is also referred to as "Extra-4th Generation (4G) Network" or "Long Term Evolution (LTE) Post-Project System". The 5G communication system is implemented in the high frequency (millimeter) band, such as the 60 GHz band, to provide increased data transmission speed. To reduce radio wave propagation losses and increase the transmission range in 5G communication systems, methods of beamforming, mass multiple input/multiple output (MIMO), full size MIMO (FD-MIMO), antenna arrays, analog beamforming, large-scale antenna are considered. In addition, in 5G communication systems, development to improve the system network is carried out on the basis of advanced small cells, cloud radio access networks (RAN), dense networks, device-to-device (D2D) communication, wireless backhaul network, mobile network, cooperative communication, coordinated multipoints ( CoMP), receive-side interference suppression, etc. In the 5G system, a hybrid of frequency shift keying (FSK) and quadrature amplitude modulation (QAM) is developed - frequency-quadrature amplitude modulation (FQAM) and sliding window superposition coding (SWSC) as an advanced modulation coding (ACM), and multiple filter bank carriers (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technology.

[3] The Internet, which is a human-centered communications network where people generate and consume information, is now evolving into the Internet of Things (IoT), where distributed entities such as things exchange and process information without human intervention. The Internet of Everything (IoE) has emerged, which combines IoT technology and big data processing technology by connecting to cloud servers. As technology elements, such as "registration technology", "wired/wireless communication and network infrastructure", "interface technology to service" and "security technology" were required for the implementation of IoT, networks of sensors, machine-to-machine (M2M) communication have been recently explored , Machine Type Communications (MTC), etc. Such an IoT environment can provide intelligent Internet technology services that add new value to human life by collecting and analyzing data generated between connected things. IoT can be applied to various fields, including smart home, smart building, smart city, smart car or connected cars, smart grid, healthcare, smart electrical appliances and advanced medical services by converging and combining existing information technology (IT) and various industrial applications. .

[4] However, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor network, machine-type communication (MTC), and machine-to-machine (M2M) communication can be implemented through beamforming, MIMO, and antenna arrays. The application of Cloud Radio Access Network (RAN) as the big data processing technology described above can also be considered as an example of the convergence of 5G technology and IoT technology.

[5] The above information is provided only as background information to assist in understanding the invention. No definition has been given, and no statement has been made as to whether any of the foregoing can be applied as prior art to the invention.

TECHNICAL PROBLEM

[6] Aspects of the invention provide for solving at least the aforementioned problems and/or disadvantages and providing at least the advantages described below. Accordingly, an aspect of the invention is to provide a method for managing packet duplication considering a two-system communication architecture, and apparatus for implementing the same.

[7] Another aspect of the invention provides a cell reselection method and apparatus for implementing the same.

[8] Additional aspects will be set forth in part in the description which follows, and in part will be apparent from the description, or may be learned by practice of the embodiments presented.

SOLUTION

[9] According to an aspect of the invention, a terminal method is provided. The method includes receiving system information related to cell reselection for a neighbor cell from a base station to which the terminal camps, in a case where the terminal supports Supplementary Uplink (SUL), and the system information includes first reception layer information of the SUL-related minimum requirement, obtaining a first cell selection reception level value based on the SUL-related minimum requirement first reception level information, and performing cell reselection to a new radio (NR) cell based on the first cell selection reception level value .

[10] In accordance with another aspect of the invention, a communication system terminal is provided. The terminal includes a transceiver and a controller connected to the transceiver. The controller is configured to receive system information related to cell reselection for a neighbor cell from the base station to which the terminal camps, in the case where the terminal supports Supplemental Uplink (SUL), and the system information includes first reception layer information of the SUL-related minimum requirement, obtain the first cell selection reception level value based on the SUL-related minimum requirement first reception level information, and perform cell reselection to the new radio (NR) cell based on the first cell selection reception level value .

[11] In accordance with another aspect of the invention, a method implemented by a base station is provided. The method includes identifying a new radio (NR) neighbor cell supporting Supplementary Uplink (SUL), generating system information related to cell reselection for the SUL-supporting NR neighbor cell, and transmitting the system information, wherein, in the case where the terminal receives system information and supports SUL, the first cell selection reception level value is obtained based on the minimum requirement first reception level information related to SUL included in the system information, and cell reselection is performed based on the first cell selection reception level value.

[12] According to another aspect of the invention, a base station is provided. The base station includes a transceiver and a controller connected to the transceiver. The controller is configured to identify a new radio (NR) neighbor cell supporting Supplementary Uplink (SUL), generate system information related to cell reselection for a SUL-supporting NR neighbor cell, and transmit system information. Moreover, in the case where the terminal receives system information and supports SUL, the first reception level value of cell selection is obtained based on the first reception level information of the minimum requirement related to SUL included in the system information, and cell reselection is performed based on the first reception level value when choosing a cell.

[13] The technical problems to be solved according to the embodiments are not limited to the above technical problems, and other technical problems that are not mentioned will be clearly understood from the following description by those skilled in the art to which the invention pertains.

[14] The technical problems to be solved according to the embodiments are not limited to the above technical problems, and other technical problems that are not mentioned will be clearly understood from the following description by those skilled in the art to which the invention pertains.

POSITIVE RESULTS OF THE INVENTION

[15] Embodiments may provide a method for managing duplication of packets considering a two-system communication architecture, and an apparatus for implementing the same.

[16] Additionally, embodiments may provide an uplink-based cell reselection method and apparatus for implementing the same.

[17] Other aspects, advantages and features of the invention will become apparent to those skilled in the art from the following detailed description, where, with reference to the accompanying drawings, various embodiments of the invention are disclosed.

BRIEF DESCRIPTION OF THE DRAWINGS

[18] The foregoing and other aspects, features and advantages of some embodiments of the invention will become apparent from the following description given with reference to the accompanying drawings, where:

[19] Fig. 1A is a block diagram showing the structure of a radio bearer for which duplication transmission is configured, according to an embodiment of the invention;

[20] Fig. 1B shows the form in which the base station controls the activation or deactivation of packet duplication, according to an embodiment of the invention;

[21] Fig. 1C shows the format of a duplicate packet activation/deactivation message according to an embodiment of the invention;

[22] Fig. 1D is a signaling diagram showing a method for configuring a radio bearer configured for packet duplication according to an embodiment of the invention;

[23] Fig. 1E is a flowchart showing a method of distinguishing between a message for applying an activation state or a deactivation state of a radio bearer and a message for not applying an activation state or a deactivation state of a radio bearer according to an embodiment of the invention;

[24] Fig. 1F is a flowchart showing a method of distinguishing between a message for applying an activation state or a deactivation state of a radio bearer and a message for not applying an activation state or a deactivation state of a radio bearer according to an embodiment of the invention;

[25] Fig. 1G is a flowchart showing a method for distinguishing between a message for applying a radio bearer activation state or deactivation state and a message for not applying a radio bearer activation state or deactivation state according to an embodiment of the invention;

[26] Fig. 1H is a flowchart showing a method of distinguishing between a message for applying an activation state or a deactivation state of a radio bearer and a message for not applying an activation state or a deactivation state of a radio bearer according to an embodiment of the invention;

[27] Fig. 1I is a flowchart showing a method of distinguishing between a message for applying an activation state or a deactivation state of a radio bearer and a message for not applying an activation state or a deactivation state of a radio bearer according to an embodiment of the invention;

[28] Fig. 1J is a flowchart showing a method of distinguishing between a message for applying an activation state or a deactivation state of a radio bearer and a message for not applying an activation state or a deactivation state of a radio bearer according to an embodiment of the invention;

[29] Fig. 1K is a flowchart showing a method for applying a radio bearer activation or deactivation state according to an embodiment of the invention;

[30] FIG. 1L is a block diagram showing a configuration of a terminal according to an embodiment of the invention;

[31] FIG. 1M is a block diagram showing a configuration of a base station according to an embodiment of the invention;

[32] FIG. 2A shows a Long Term Evolution (LTE) project base station connected to a new generation mobile communication network according to an embodiment of the invention;

[33] FIG. 2B shows additional uplink frequency application according to an embodiment of the invention;

[34] FIG. 2CA and 2CB are flowcharts showing the process of broadcasting frequency dependent cell reselection priority information via a system information block (SIB) or applying frequency dependent cell reselection priority information to a specific terminal via a connection release message in the radio resource control layer ( RRC), which is specific RRC signaling, according to various embodiments of the invention;

[35] FIG. 2D shows a method for performing cell reselection by a terminal according to an embodiment of the invention;

[36] FIG. 2E is a flowchart showing the operation of a terminal that is anchored in LTE to perform cell reselection to a new radio (NR) cell according to Embodiment 2-1 of the invention;

[37] FIG. 2F is a flowchart showing the operation of a terminal which is anchored in LTE to perform cell reselection to an NR cell according to Embodiment 2-1 of the invention;

[38] FIG. 2G is a flowchart showing the operation of a terminal that is anchored on an NR to perform cell reselection in favor of an NR neighbor cell according to Embodiment 2-2 of the invention;

[39] FIG. 2H is a flowchart showing the operation of a terminal that is anchored on an NR to perform cell reselection in favor of an NR neighbor cell according to Embodiment 2-2 of the invention;

[40] FIG. 2I is a block diagram showing a configuration of a terminal according to an embodiment of the invention; and

[41] FIG. 2J is a block diagram showing a configuration of a base station according to an embodiment of the invention.

[42] In the drawings, like reference numerals refer to like parts, components, and structures.

EMBODIMENTS FOR CARRYING OUT THE INVENTION

[43] The following description, with reference to the accompanying drawings, is provided to assist in a full understanding of the various embodiments of the invention as defined by the claims and their equivalents. It includes various specific details to assist in this understanding, but they should be considered illustrative only. Accordingly, those skilled in the art will recognize that various changes and modifications to the various embodiments described herein may be made without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions may be omitted for clarity and brevity.

[44] The terms and words used in the following description and claims are not limited to bibliographic meanings, but are used by the inventor only to provide a clear and consistent understanding of the invention. Accordingly, those skilled in the art will appreciate that the following description of various embodiments of the invention is only intended to illustrate, and not to limit, the invention as defined by the following claims and their equivalents.

[45] It should be understood that the singular forms include references to the plural, unless the context clearly indicates otherwise. Thus, for example, a reference to a "component surface" includes a reference to one or more of such surfaces.

[46] In the description of the embodiments in this specification, the description of technical content well known in the technical field to which the invention pertains and not directly related to the invention will be omitted. This avoidance of unnecessary descriptions is intended to prevent obscuring the subject matter and to provide a clearer presentation of the subject matter.

[47] For the same reason, some elements are exaggerated, omitted or schematically illustrated in the accompanying drawings. Additionally, the size of each element does not fully reflect its actual size. In each drawing, the same or corresponding elements are designated by the same reference numerals.

[48] The advantages and features of the invention and methods for their implementation will be apparent from the detailed description of the embodiments below with reference to the accompanying drawings. However, the invention is not limited to the embodiments disclosed herein, but may be embodied in various other forms. The following embodiments are provided only for the sake of completeness of the invention and to fully inform those skilled in the art of the scope of the invention, and the invention is only defined by the scope of the following claims. In the description of the invention, the same or similar reference numerals indicate the same or similar elements.

[49] Here, it can be understood that each flowchart of processing operations and combinations of flowcharts of operations can be carried out by instructions of a computer program. Since these computer program instructions may be loaded into processors for a general purpose computer, a special purpose computer, or other programmable data processing devices, these instructions, executable by processors for a computer or other programmable data processing devices, form a means for performing the functions described in the block(s) block diagrams of operations. Since these computer program instructions may also be stored in the computer usable or computer readable memory of a computer or other programmable data processing devices to implement functions in a particular circuit, the computer program instructions stored in the computer usable or computer readable memory can also create products. production, including an instruction means that performs the functions described in the block(s) of the flowcharts of operations. Since computer program instructions may also be downloaded to a computer or other programmable data processing devices, the instructions may direct a sequence of steps to be performed on a computer or other programmable data processing devices to generate computer-executable processes and enable the computer or other programmable data processing devices to operate, and may also provide steps for implementing the functions described in the flowchart.

[50] In addition, each block may indicate some of the modules, segments, or codes, including one or more executable instructions to perform a particular(s) logic(s) function(s). Additionally, it should be noted that in some alternative embodiments, the functions mentioned in the blocks may appear in a different order. For example, the two blocks illustrated in sequence may be performed substantially simultaneously, or may sometimes be performed in reverse order, according to the respective functions.

[51] The term "unit..." as used herein according to an embodiment means software or hardware elements such as field programmable gate array (FPGA) and application specific integrated circuit (ASIC), and "unit..." can take any role. However, the meaning of "block..." is not limited to software or hardware. The "block..." may be configured to reside on an accessable storage medium and may also be configured to be rendered by one or more processors. Accordingly, "block...", for example, includes: elements, such as program elements, object-oriented program elements, class elements, and task elements; and processors, functions, attributes, procedures, subroutines, code segments, drivers, firmware, microcode, schemas, data, databases, data structures, tables, arrays, and variables. Functions provided in elements and "blocks..." may be combined with fewer elements and "blocks..." or may be further divided into additional elements and "blocks...". In addition, elements and "blocks..." can also be implemented to render one or more central processing units (CPUs) in a device or secure media card.

[52] First Embodiment

[53] FIG. 1A is a block diagram showing the structure of a radio data bearer (DRB) configured for duplicating transmission according to an embodiment of the invention.

[54] Referring to FIG. 1A, it is assumed that three DRBs are configured, that is, DRB1 1a-10, DRB2 1a-20, and DRB3 1a-30, and each DRB corresponds to one Packet Data Convergence Protocol (PDCP) device. Packet duplication is accomplished by duplicating one packet at the transmitter's PDCP layer and delivering it to each of the different Radio Link Control (RLC) devices. For this, a DRB for which packet duplication is configured needs at least two RLC devices corresponding to one PDCP device. According to the embodiment shown in FIG. 1A, PDCP1 1a-10 connected to RLC1 1a-40 and RLC2 1a-50, PDCP2 1a-20 connected to RLC3 1a-60 and RLC4 1a-70, and PDCP3 1a-30 connected to RLC5 1a-80 and RLC6 1a-90 . RLC devices connected to one PDCP device can be classified into: primary RLC devices 1a-40, 1a-60 and 1a-80; and secondary RLC devices 1a-50, 1a-70 and 1a-90. The primary RLC devices 1a-40, 1a-60, and 1a-80 are RLC devices configured to deliver packets at the PDCP level of the transmitter regardless of whether packet duplication is enabled, and the secondary RLC devices 1a-50, 1a- 70 and 1a-90 are configured to deliver packets at the transmitter's PDCP layer only if packet duplication is enabled. According to the embodiment shown in FIG. 1A, it is assumed that the primary RLC for DRB1 1a-10 is RLC1 1a-40, the primary RLC for DRB2 1a-20 is RLC2 1a-60, and the primary RLC for DRB3 1a-30 is RLC3 1a-80.

[55] In a dual-system communication or multi-system communication architecture in which, for such packet duplication transmission, a terminal is connected to two base stations, there may also be a configured radio bearer for which packet duplication is configured. In this example, connections to respective base stations can be classified into Cell Groups (CGs). The embodiment shown in FIG. 1A assumes a dual-system communication architecture and implements a primary cell group 1a-100 cell (MCG) configuration that is capable of communicating with a primary base station and a secondary cell group 1a-110 cell (SCG) configuration that is capable of communicating with a secondary base station. According to the embodiment shown in FIG. 1A, all RLC devices 1a-40 and 1a-50 connected to DRB1 1a-10 are connected to MCG 1a-100, and this configuration means that the packet duplication transmission performed on DRB1 1a-10 is performed on MCG 1a- 100. In this example, a list of cells that can be used by each RLC device can be made in advance, and each RLC device transmits data only in the cell specified in the list. Because among the RLC devices connected to DRB2 1a-20, RLC3 1a-60 is connected to MCG 1a-100 and RLC4 1a-70 is connected to SCG 1a-110, this configuration means that the duplication transmission performed on DRB2 1a -20, performed by both MCG 1a-100 and SCG 1a-110. Since all RLC devices 1a-80 and 1a-90 connected to DRB3 1a-30 are connected to SCG 1a-110, this configuration means that the duplication transmission performed on DRB3 1a-30 is performed on SCG 1a-110 . In this example, a list of cells that can be used by each RLC device can be made in advance, and each RLC device only transmits data on the cell specified in the list.

[56] DRBs configured for transmission with duplication of packets can be classified into duplex (DC duplication) type packets (DC duplication) and carrier aggregation (CA) type packet duplication (CA duplication). The duplication of DC-type packets assumes that the transmission of the packet is carried out on a bearer channel on which the corresponding RLC devices are connected to different CGs, as in the case of DRB2 1a-20. The duplication of CA-type packets assumes that, as in the case of DRB1 1a-10 and DRB3 1a-30, all RLC devices are connected to an identical cell group, and a list of cells that can be used by each RLC device is pre-compiled.

[57] FIG. 1B shows the form in which the base station controls the activation or deactivation of duplication of packets, according to an embodiment of the invention.

[58] Referring to FIG. 1B, duplicative packet transmission is capable of transmitting the same packet using at least two RLC devices, and thus increases the consumption of wireless resources. Because duplication of packets may reduce the efficiency of radio resource usage, packet duplication should not always be performed. Therefore, packet duplication transmission can only be performed as needed, and a configuration that allows a bearer radio for which packet duplication is configured to actually perform packet duplication is referred to as "packet duplication activation". In contrast, a configuration that allows a bearer radio configured with packet shadowing not to perform packet shadowing is referred to as "packet shadow deactivation".

[59] In step 1b-10, the base station may send a duplication activation/deactivation message to the terminal. In this example, the applied message can use the message in the same form for activation or deactivation, and the included values can be used to distinguish activation of duplicate packets from its deactivation. The packet duplication enable/disable message may indicate on which radio bearer packet duplication is enabled or disabled. In step 1b-20, after the terminal receives the message, the terminal may apply duplication activation or deactivation according to the indication included in the message.

[60] FIG. 1C shows the format of a duplication activation/deactivation message according to an embodiment of the invention.

[61] Referring to FIG. 1C, the message is assumed to be in the format of a Medium Access Control (MAC) Control Element (CE) including one byte, that is, eight bits. Each of the eight bits indicates the activation or deactivation of duplication transmission on a particular radio bearer, where "1" may represent activation and "0" may represent deactivation. The eight bits in FIG. 1C may indicate the activation or deactivation status of duplication of packets on each of up to eight radio bearers.

[62] Embodiments propose using one or another shadow activation/deactivation message to convey the activation or deactivation state of a radio bearer. In this example, the indication of a particular radio bearer by each bit in the shadow activation/deactivation message is implemented by applying one of the following configurations:

[63] - bits indicate identifiers (ID) in ascending or descending order for DRBs among DRBs, each of which is configured with duplication of packets and each of which includes an RLC device connected to the cell group on which the corresponding MAC CE is transmitted ( MAC CE to indicate the activation or deactivation of duplication on the radio bearer);

[64] - The bits indicate an ID in upstream or downstream order for DRBs among DRBs each configured with packet duplication and each including a primary RLC device connected to a cell group on which the corresponding MAC CE is transmitted;

[65] - The bits indicate the ID in ascending or descending order for DRBs among DRBs each configured with packet duplication and each including a secondary RLC device connected to the cell group on which the corresponding MAC CE is transmitted;

[66] - The bits indicate an ID in ascending or descending order for DRBs among DRBs each configured with duplication of packets and each including a PDCP anchor base station included in the base station node corresponding to the cell group on which the corresponding is transmitted. MAC CE;

[67] - The bits indicate an ID in ascending or descending order for DRBs among DRBs each configured with duplicate packets and each including an encryption key (security key) of the base station node corresponding to the cell group on which the corresponding MAC is transmitted CE;

[68] - With respect to indicating the activation or deactivation of packet duplication using the corresponding MAC CE, the bits indicate an ID in ascending or descending order for DRBs among DRBs each configured with packet duplication configured in advance by the base station;

[69] - in the case of a MAC CE transmitted in the MCG, the bits indicate the ID in upstream or downstream order for the DRB with respect to the DRB for which the CA type packet duplication is configured on the MCG and the DRB for which the DC type packet duplication is configured, configured on the MCG. In the case of a MAC CE transmitted on the SCG, the bits indicate the ID in upstream or downstream order for the DRBs with respect to the DRBs each configured with duplication of the CA type packets configured on the SCG; or

[70] - The base station indicates the bit position of the specific MAC CE.

[71] FIG. 1D is a signaling diagram showing a configuration procedure for a DRB configured for packet duplication according to an embodiment of the invention.

[72] Referring to FIG. 1D, in steps 1d-10, the base station transmits a radio resource control (RRC) layer configuration message to the terminal. The base station may generate or modify the radio bearer using the RRC configuration message and may configure duplicating packets for the radio bearer. In this example, the base station may configure a DRB ID of each radio bearer and a logical channel ID corresponding to each RLC device, and may configure a radio bearer including at least two RLC devices for one PDCP device shown on fig. 1A with these respective IDs. In this example, the base station may be configured such that the primary RLC device is different from the secondary RLC device among the RLC devices. In step 1d-20, the terminal may receive a configuration message, and upon completion of the terminal configuration change, may transmit an RRC configuration complete message to the base station. The terminal may inform the base station of the completion of the configuration according to the configuration message using the RRC configuration complete message.

[73] FIG. 1E is a flowchart showing a method of distinguishing between a shadow activation/deactivation message for applying a radio bearer activation/deactivation state and a shadow activation/deactivation message for not applying a radio bearer activation/deactivation state according to an embodiment of the invention.

[74] Referring to FIG. 1E, it can be assumed that the duplicate packet activation/deactivation message format uses the MAC CE format described with reference to FIG. 1C, but the invention is not limited to this. If packet shadowing is configured for DRB in operation 1e-10, then in operation 1e-20, the terminal may determine, for all CGs used by the terminal, whether the MAC CE received in a particular cell group is to be used to enable or disable packet shadowing for DRB. cell groups. In operation 1e-20, which cell group is connected to the network node where the base station of the PDCP anchor for DRB (for which the activation or deactivation of duplication of packets is determined) is located, can become a determination criterion. If the base station of the PDCP anchor for DRB is located at the network node connected to the first cell group in operation 1e-30, the terminal may apply duplication activation or deactivation for DRB using the MAC CE transmitted in the first cell group. If the PDCP anchor base station for DRB is not located at the network node connected to the first cell group in operation 1e-40, the terminal does not apply the relevant DRB duplicate packet activation or deactivation using the MAC CE transmitted in the first cell group. For example, if, for DRB, the PDCP anchor base station is located at the master node, the terminal applies DRB shadowing activation or deactivation using the MAC CE adopted in the MCG, and does not apply DRB shadowing activation or deactivation for DRB using the MAC CE received on SCG. However, although the MAC CE is not used to apply duplication activation or deactivation to the DRB, the bit may correspond to the DRB in the MAC CE. Even if any MAC CE bit corresponds to DRB, when the relevant MAC CE is not used to apply duplication activation or deactivation, the terminal may ignore the bit.

[75] FIG. 1F is a flowchart showing a method of distinguishing between a shadow activation/deactivation message for applying a radio bearer activation/deactivation state and a shadow activation/deactivation message for not applying a radio bearer activation/deactivation state according to an embodiment of the invention.

[76] Referring to FIG. 1F, it can be assumed that the duplicate packet activation/deactivation message format uses the MAC CE format described with reference to FIG. 1C, but the invention is not limited to this. If packet shadowing is configured for DRB in operation 1f-10, then in operation 1f-20, the terminal may determine, for all CGs used by the terminal, whether the MAC CE received in a particular cell group is to be used to enable or disable packet shadowing for DRB. cell groups. In operation 1f-20, to which cell group the network node is connected, where the security key used on the DRB is the security key corresponding to the network node, may become a determination criterion. If the security key used on the DRB is the security key corresponding to the network node connected to the first cell group in operation 1f-30, the terminal may apply duplicate packet activation or deactivation for DRB using the MAC CE transmitted in the first cell group. If the security key used on the DRB is not the security key corresponding to the network node connected to the first cell group in operation 1f-40, the terminal does not apply duplicate packet activation or deactivation for DRB using the MAC CE transmitted in the first cell group. For example, if the security key used on the DRB is KgNB, which is the master node's security key, the terminal applies duplicate packet activation or deactivation for DRB using the MAC CE adopted in the MCG. If the security key used on the DRB is S-KgNB, which is the security key of the secondary node, the terminal applies duplication activation or deactivation for DRB using the MAC CE received at the SCG. However, although the MAC CE is not used to apply duplication activation or deactivation to the DRB, the bit may correspond to the DRB in the MAC CE. Even if any MAC CE bit corresponds to DRB, when the relevant MAC CE is not used to apply duplication activation or deactivation, the terminal may ignore the bit.

[77] FIG. 1G is a flowchart showing a method of distinguishing between a shadow activation/deactivation message for applying a radio bearer activation/deactivation state and a shadow activation/deactivation message for not applying a radio bearer activation/deactivation state according to an embodiment of the invention.

[78] Referring to FIG. 1G, it can be assumed that the duplicate packet activation/deactivation message format uses the MAC CE format described with reference to FIG. 1C, but the invention is not limited to this. If packet shadowing is configured for DRB in operation 1g-10, then in operation 1g-20, the terminal may determine, for all CGs used by the terminal, whether the MAC CE received in a particular cell group is to be used to enable or disable packet shadowing for DRB. cell groups. In operation 1g-20, whether the relevant cell group is the cell group used by the primary RLC of the relevant DRB may become a determination criterion. If the primary RLC for DRB is connected to the first cell group, in operation 1g-30, the terminal may apply duplicate packet activation or deactivation for DRB using the MAC CE transmitted in the first cell group. If the primary RLC for DRB is not connected to the first cell group, in operation 1g-40, the terminal may not apply the relevant DRB duplication activation or deactivation using the MAC CE transmitted in the first cell group. For example, if the primary RLC for DRB is connected to the MCG, the terminal applies DRB shadowing activation or deactivation using the MAC CE received in the MCG and does not apply DRB shadowing activation or deactivation using the SCG MAC CE. However, although the MAC CE is not used to apply duplication activation or deactivation to the DRB, the bit may correspond to the DRB in the MAC CE. Even if any MAC CE bit corresponds to DRB, when the relevant MAC CE is not used to apply duplication activation or deactivation, the terminal may ignore the bit.

[79] FIG. 1H is a flowchart showing a method of distinguishing between a shadow activation/deactivation message for applying a radio bearer activation/deactivation state and a shadow activation/deactivation message for not applying a radio bearer activation/deactivation state according to an embodiment of the invention.

[80] Referring to FIG. 1H, it can be assumed that the duplicate packet activation/deactivation message format uses the MAC CE format described with reference to FIG. 1C, but the invention is not limited to this. If packet shadowing is configured for DRB in operation 1h-10, then in operation 1h-20, the terminal may determine, for all CGs used by the terminal, whether the MAC CE received in a particular cell group is to be used to enable or disable packet shadowing for DRB. . In operation 1h-20, whether the relevant cell group is the cell group used by the secondary RLC of the relevant DRB may become a determination criterion. If the secondary RLC for DRB is connected to the first cell group, in operation 1h-30, the terminal may apply duplication activation or deactivation for DRB using the MAC CE transmitted in the first cell group. If the secondary RLC for DRB is not connected to the first cell group, in operation 1h-40, the terminal does not apply duplication activation or deactivation for DRB using the MAC CE transmitted in the first cell group. For example, if a secondary RLC for DRB is connected to the MCG, the terminal applies shadowing activation or deactivation for DRB using the MAC CE received in the MCG and does not apply shadowing activation or deactivation for DRB using the MAC CE received in the SCG. However, although the MAC CE is not used to apply duplication activation or deactivation to the DRB, the bit may correspond to the DRB in the MAC CE. Even if any MAC CE bit corresponds to DRB, when the relevant MAC CE is not used to apply duplication activation or deactivation, the terminal may ignore the bit.

[81] FIG. 1I is a flowchart showing a method of distinguishing between a shadow activation/deactivation message for applying a radio bearer activation/deactivation state and a shadow activation/deactivation message for not applying a radio bearer activation/deactivation state according to an embodiment of the invention.

[82] Referring to FIG. 1I, it can be assumed that the duplicate packet activation/deactivation message format uses the MAC CE format described with reference to FIG. 1C, but the invention is not limited to this. If packet shadowing is configured for DRB in operation 1i-10, then in operation 1i-20, the terminal may determine, for all CGs used by the terminal, whether the MAC CE received in a particular cell group is to be used to enable or disable packet shadowing for DRB. . In operation 1i-20, whether the base station configures the cell group in which the MAC CE is to be transmitted to apply duplication activation or deactivation to the relevant DRB may become a determination criterion. In this example, the base station configuration may be indicated in the RRC configuration message shown in FIG. 1D. If the base station configures the cell group to transmit the MAC CE to control the activation or deactivation of packet shadowing on the relevant DRB in operation 1i-30, the terminal may apply the activation or deactivation of packet shadowing for DRB using the MAC CE transmitted in the cell group. If the base station does not configure the cell group to transmit the MAC CE to control DRB shadowing activation or deactivation in operation 1i-40, the terminal does not apply the DRB shadowing activation or deactivation using the MAC CE transmitted in the cell group. For example, if the DRB shadowing activation or deactivation is configured to be applied using the MAC CE adopted in the MCG, the terminal applies the DRB shadowing activation or deactivation using the MAC CE adopted in the MCG and does not apply the activation or deactivation of duplication of packets for DRB using the MAC CE received at the SCG. However, although the MAC CE is not used to apply duplication activation or deactivation to the DRB, the bit may correspond to the DRB in the MAC CE. Even if any MAC CE bit corresponds to DRB, when the relevant MAC CE is not used to apply duplication activation or deactivation, the terminal may ignore the bit.

[83] FIG. 1J is a flowchart showing a method of distinguishing between a shadow activation/deactivation message for applying a radio bearer activation/deactivation state and a shadow activation/deactivation message for not applying a radio bearer activation/deactivation state according to an embodiment of the invention.

[84] Referring to FIG. 1J, it can be assumed that the duplicate packet activation/deactivation message format uses the MAC CE format described with reference to FIG. 1C, but the invention is not limited to this. If packet shadowing is configured for DRB in operation 1j-10, then in operation 1j-20, the terminal may determine, for all CGs used by the terminal, whether the MAC CE received in a particular cell group is to be used to enable or disable packet shadowing for DRB. . In this example, only a particular cell group can control the activation or deactivation of packet duplication on the relevant DRB. According to the embodiment shown in FIG. 1J, in operation 1j-30, the terminal applies the activation or deactivation of packet duplication of each of all DRBs for which packet duplication is configured using only the MAC CE received in the MCG. In operation 1j-40, the terminal does not apply duplication activation or deactivation using the MAC CE received in another cell group other than the MCG. However, although the MAC CE is not used to apply duplication activation or deactivation to the DRB, the bit may correspond to the DRB in the MAC CE. Even if any MAC CE bit corresponds to DRB, when the relevant MAC CE is not used to apply duplication activation or deactivation, the terminal may ignore the bit. According to the embodiment shown in FIG. 1J, it is assumed that the activation or deactivation of duplication of packets is controlled using only the MAC CE adopted in the MCG, but this criterion may be specified for the SCG or a specific cell group, and thus can be applied to it.

[85] FIG. 1K is a flowchart showing a method for applying a radio bearer activation or deactivation state according to an embodiment of the invention.

[86] Referring to FIG. 1K, it can be assumed that the duplicate packet activation/deactivation message format uses the MAC CE format described with reference to FIG. 1C, but the invention is not limited to this. If packet duplication is configured for DRB by the base station in operation 1k-10, then in operation 1k-20, the terminal may identify whether the relevant radio bearer is a dual-mode type radio bearer. In operation 1k-30, if the relevant DRB is a dual-mode type radio bearer, the always active state may be applied to duplicating DRB packets. In this example, the base station may configure the MAC CE to always enable duplication of packets of a dual-mode type radio bearer for which duplication of packets is configured, according to a preconfigured scheme. Alternatively, the terminal may always apply duplicate packet activation regardless of the set MAC CE value. If the DRB is not a dual-mode type radio bearer, in operation 1k-40, one node determines, for DRB, the activation or deactivation of packet shadowing, and thus the MAC CE is not used to apply the activation or deactivation of packet shadowing for DRB. However, although the MAC CE is not used to apply duplication activation or deactivation to the DRB, the bit may correspond to the DRB in the MAC CE. Even if any MAC CE bit corresponds to DRB, when the relevant MAC CE is not used to apply duplication activation or deactivation, the terminal may ignore the bit.

[87] FIG. 1L is a block diagram showing a configuration of a terminal according to an embodiment of the invention.

[88] Referring to FIG. 1L, the terminal may include a transceiver 1l-10, a controller 1l-20, and a storage unit 1l-30. In the invention, the controller 1l-20 may be defined as a circuit, an ASIC, or at least one processor.

[89] The transceiver 1l-10 may transmit or receive a signal to or from another network entity. For example, the transceiver 1l-10 may receive system information from the base station and may receive a synchronization signal or a reference signal from it.

[90] The controller 1l-20 can control the operation of the terminal as a whole according to the embodiment proposed in the invention. For example, the controller 1l-20 may control the communication between the units to perform the above-described operations according to the above flowcharts.

[91] The storage unit 1l-30 may store at least one of information transmitted or received via the transceiver 1l-10 and information generated by the terminal controller 1l-20.

[92] FIG. 1M is a block diagram showing a configuration of a base station according to an embodiment of the invention.

[93] Referring to FIG. 1M, the base station may include a transceiver 1m-10, a controller 1m-20, and a storage unit 1m-30. In the invention, the controller 1m-20 may be defined as a circuit, an ASIC, or at least one processor.

[94] The transceiver 1m-10 may transmit or receive a signal to or from another network entity. For example, transceiver 1m-10 may transmit system information to the terminal and may transmit a synchronization signal or a reference signal to it.

[95] The controller 1m-20 may control the operation of the base station as a whole according to the embodiment proposed in the invention. For example, the controller 1m-20 may control the communication between the units to perform the above-described operations according to the above flowcharts.

[96] The storage unit 1m-30 may store at least one of information transmitted or received via the transceiver 1m-10 and information generated by the controller 1m-20.

[97] Second Embodiment

[98] FIG. 2A shows the structure of a new generation mobile communication system according to an embodiment of the invention.

[99] Referring to FIG. 2A, a radio access network of a new generation mobile communication (NR) system includes a new generation base station (NR Node B) (hereinafter "gNB") 2a-10 and an access and mobility management function (AMF) (NR core network) 2a-05 . The user equipment (NR user equipment) (hereinafter "UE NR", "UE", or "terminal") 2a-15 accesses the external network via gNB 2a-10 and AMF 2a-05.

[100] FIG. 2A gNB 2a-10 corresponds to the advanced Node B (eNB) of the current Long Term Evolution (LTE) system. gNB 2a-10 is wirelessly connected to NR UE 2a-15 and can provide improved service over the current Node B (denoted 2a-20). Since, in a new generation mobile communication system, all user traffic is provided through a shared channel, a device capable of collecting UE state information including a buffer state, an available transmission power state, a channel state, etc. is needed, and thus perform planning, and gNB 2a-10 acts as such a device. One gNB generally manages multiple cells. In order to realize super-speed data transmission, compared to today's LTE, the existing maximum bandwidth or more can be provided, and orthogonal frequency division multiplexing (hereinafter referred to as "OFDM") can be used as a wireless access technology with which beamforming technology can be further combined. Additionally, an adaptive modulation scheme and coding (hereinafter referred to as "AMC") is applied to determine the modulation scheme and the channel coding rate according to the channel state of the terminal. The AMF 2a-05 performs functions such as mobility support, bearer configuration, quality of service (QoS) configuration, and so on. base stations. Further, the new generation mobile communication system can communicate with the current LTE system, and the AMF 2a-05 is connected to the mobility management (MME) node 2a-25 of the LTE system via a network interface. MME 2a-25 is connected to eNB 2a-30, which is currently the base station. A terminal 2a-15 supporting dual-system LTE-NR communication can transmit or receive data while maintaining not only a connection with gNB 2a-10 but also a connection with eNB 2a-30 (denoted by reference numeral 2a-35).

[101] FIG. 2B shows additional uplink frequency application according to an embodiment of the invention.

[102] Referring to FIG. 2B, in a mobile communication system, there may be cases where the uplink coverage area does not match the downlink coverage area. The mismatch occurs due to a difference between the uplink channel characteristics and the downlink channel characteristics, a maximum transmit power limitation of the terminal, or a design limitation of the transmitting antenna. In general, the downlink coverage area exceeds the uplink coverage area. As an example, in a time division duplex (TDD) system in the 3.5 GHz band, downlink coverage area 2b-05 exceeds uplink coverage area 2b-10. In this example, the first terminal 2b-20 receives uplink and downlink services without problems, but the second terminal 2b-25 fails to successfully transmit data to the base station 2b-15 on the uplink. Therefore, in order to solve the problem caused by the above-described mismatch, it is possible to reduce the effective downlink coverage area to match the uplink coverage area. Thus, although a larger coverage area can be provided on the downlink, the downlink coverage area cannot be smaller than the uplink coverage area.

[103] In order to solve the problem of performance limitation due to such a mismatch, the new generation mobile communication system allows the terminal to operate on an uplink frequency having a larger coverage area. As an example, the terminal is further provided with a 1.8 GHz uplink coverage area 2b-30 separate from a 3.5 GHz uplink coverage area. The additional uplink frequency is referred to as "Supplementary Uplink (SUL) frequency". Therefore, due to the frequency characteristics, the lower the frequency range, the greater the distance of the wireless signal. Therefore, 1.8 GHz, which is below 3.5 GHz, allows you to increase the coverage area. As a result, the second terminal 2b-50 can successfully transmit data to the base station 2b-40 using the 1.8 GHz uplink coverage area 2b-35. In addition, the first terminal 2b-45 does not encounter the problematic coverage area, but can use both the 1.8 GHz uplink coverage area and the 3.5 GHz uplink coverage area. Therefore, the first terminal 2b-45 may select one of the 1.8 GHz and 3.5 GHz bands to eliminate uplink access congestion, and may use it. The additional uplink frequency may be an LTE frequency.

[104] The NR uplink frequency and the SUL frequency can be configured for one terminal, and in this example, the physical uplink shared channel (PUSCH), which is an uplink data channel, can be transmitted on only one uplink at a time . The Physical Uplink Control Channel (PUCCH) may also be transmitted on only one uplink at a time, and may be transmitted on an uplink identical to or different from the uplink on which the PUSCH is transmitted.

[105] FIG. 2CA and 2CB show two parts of a flowchart showing a process of broadcasting frequency-dependent priority information for cell reselection by SIB or applying frequency-dependent priority information for cell reselection to a specific terminal via an RRC Connection Release message, which is a specific signaling. RRC, in LTE technology according to various embodiments of the invention.

[106] Referring to FIG. 2CA and 2CB, cell reselection means a serving cell reselection process to allow a moving terminal to connect to a cell having the best channel condition. The network assigns a priority to each frequency and thus manages cell reselection at the terminals in the sleep mode. For example, one terminal has received priority information for two frequencies f1 and f2, and if f1 has a higher priority than f2, the probability that the terminal stays at f1 increases. Also, while the terminal remains at f2, if the channel state of f2 is not good, the terminal may attempt to switch to f1. The frequency priority information may be broadcast by the SIB, or may be provided to a specific terminal by an RRC Connection Release message, which is RRC specific signaling. Although the terminal already has priority information for frequencies by SIB, if the terminal receives UE-specific priority information by RRC signaling, the SIB priority information is ignored. The priority information for each frequency is delivered via the cellReselectionPriority information element (IE) described below, and each frequency is assigned one of the priorities having a total of (X+1) levels. A smaller value means a lower priority. So "0" means the lowest priority.

[107] cellReselectionPriority information element

[108]

[109] Radio Access Technology (RAT) associated frequencies may not be assigned the same priority. If the idle state of the terminal is "any cell camping state", the frequency priority information received by the SIB is applied, and the priority information received by the RRC signaling is only stored without using it. IE cellReselectionPriority is an optional IE and may not exist. In this example, the priority information for the corresponding frequency is not assigned. In this example, the terminal considers the corresponding frequency priority as the lowest level.

[110] In operation 2c-00, the terminal receives priority information for frequencies used not only in Evolved Universal Terrestrial Radio Access (EUTRA) but also in RAT other than EUTRA via SIB. However, priority information need not be provided for all frequencies. The priority information for the frequency of the serving cell on which the terminal is currently camping may also not be provided. In operation 2c-05, the terminal identifies whether there is priority information for the frequency of the current serving cell. If the priority information for the frequency of the current serving cell is not provided, the terminal may consider the frequency priority as the lowest level in operation 2c-10.

[111] In step 2c-15, the terminal applies the priority information for each frequency received by the SIB. If the terminal receives a Radio Resource Control (RRC) connection release message from the base station, the terminal switches from the connected mode to the sleep mode. The RRC connection release message may include frequency priority information. The priority information is user equipment (UE) dependent information and is generally applied in preference to frequency priority information received from the SIB. Therefore, in step 2c-20, the terminal identifies whether the RRC connection release message includes frequency priority information. If the RRC connection release message includes frequency priority information, in step 2c-25, the terminal applies the first timer value included with the frequency priority information, and thus starts the first timer. In step 2c-30, the terminal determines whether the current sleep mode state is "any cell camping state" or "normal camping state". "Normal camping state" means a state in which a terminal camps on a suitable cell. The suitable cell can provide normal service to the terminal, and satisfies the following specific conditions:

[112] - the cell corresponds to one Public Land Mobile Network (PLMN) in the Selected Public Land Mobile Network (PLMN) list, Registered PLMN list, or Equivalent PLMN list;

[113] - cell that is not prohibited;

[114] - cell that satisfies the cell selection criterion;

[115] - "Any cell camping state" means a state in which the terminal fails to camp on a suitable cell, and thus camps on an acceptable cell. In an acceptable cell, the terminal may not receive normal service and may attempt to make an emergency call. An acceptable cell satisfies the following conditions:

[116] - cell that is not prohibited; or

[117] - a cell that satisfies the cell selection criterion.

[118] If the terminal is in the idle state corresponding to "Any Cell Camping State", instead of applying the priority information received by the RRC Connection Release message, the terminal returns to step 2c-15 and applies the frequency priority information received by the SIB. If the terminal is in the idle state corresponding to the “normal docking state,” in step 2c-35, the terminal determines whether at least one of the following three conditions is met. Three conditions are given:

[119] - the terminal switches to connection mode.

[120] - The first timer has expired.

[121] - The PLMN selection process is performed upon the request of the Non-Access Layer (NAS).

[122] If any of the above conditions are met, in step 2c-40, the terminal deletes the priority information received by the RRC Connection Release message and returns to step 2c-15 and applies the frequency priority information received by the SIB. If either condition is not met, in step 2c-45, the terminal applies the priority information received by the RRC Connection Release message.

[123] The frequency priority information affects the measurement of a specific frequency by the terminal. The terminal always measures a frequency that has a higher priority than the current serving cell. On the contrary, in order to save the power of the terminal, the terminal does not perform measurement at a frequency (intra-frequency) equal to the frequency of the serving cell, or other frequencies, each of which has a priority lower than or equal to the priority of the serving cell. The measurement is performed if the QoS of the serving cell is less than or equal to a specific threshold. Cell reselection is performed to move to a cell having a good channel state, and since the current serving cell has a good channel QoS, the terminal does not need to change to a frequency lower than or equal to the priority of the serving cell. Therefore, whether or not to carry out the measurement is determined based on a specific threshold for reducing power consumption due to unnecessary channel measurement. In the same frequency case (intra-frequency mode), if the QoS of the serving cell is lower than or equal to the specific SintraSearch threshold, the terminal performs channel measurement on other cells having the same frequency. In the case of other frequencies, each of which has a priority lower than or equal to that of the serving cell, if the QoS of the serving cell is lower than or equal to a specific SintraSearch threshold, the terminal performs channel measurement on the respective cells having different frequencies. In general, link QoS takes into account the received power of the reference signal (RSRP) and the received quality (RSRQ) of the reference signal.

[124] If the channel QoS of the cell having the higher priority frequency becomes higher than the specific threshold ThreshX-high while the terminal is measuring in the manner described above, the terminal reselects the cell having the higher priority frequency as the serving cell. If the channel QoS of the cell having the lower priority frequency is higher than the specific threshold ThreshX-high and the QoS of the serving cell becomes lower than ThreshServing-low, the terminal reselects the cell having the lower frequency as the serving cell.

[125] FIG. 2D shows a method for performing cell reselection by a terminal according to an embodiment of the invention.

[126] Referring to FIG. 2D, the terminal always performs the inter-frequency/inter-RAT measurement on the higher priority frequency or RAT regardless of the signal strength measurement for serving cell 2d-05. If the signal strength measurement for serving cell 2d-05 is lower than SintraSearch 2d-25, the terminal performs an intra-frequency measurement. If the signal strength measurement for serving cell 2d-05 is lower than SnonintraSearch 2d-30, the terminal performs an inter-frequency/inter-RAT measurement at a frequency having a priority lower than or equal to the frequency priority of the current serving cell 2d-05. The measurement at the terminal is initiated in stages to reduce its power consumption due to the neighboring cell measurement. If the link QoS of the cell 2d-10 having the higher priority frequency becomes higher than the specific threshold ThreshX-high 2d-35, the terminal reselects the cell 2d-10 having the higher priority frequency as the new serving cell. If the link QoS of cell 2d-00 having a lower priority frequency is higher than a specific threshold ThreshX-low 2d-15 and the QoS of serving cell 2d-05 becomes lower than ThreshServing-low 2d-20, the terminal reselects cell 2d as a new serving cell -00, which has a lower priority frequency.

[127] Cell reselection can rely on RSRP or RSRQ. RSRP or RSRQ is calculated according to S-criteria. In other words, RSRP or RSRQ is Srxlev or Squal.

[128] Srxlev=Q _rxlevmeas - (Q _rxlevmin +Q _{rxlevminoffset} ) - P _compensation - Qoffset _temp

[129] Squal=Q _qualmeas - (Q _qualmin +Q _{qualminoffset} ) - Qoffset _temp

[130] where:

[131]

Srxlev Cell selection reception level value (dB) Squal Cell Selection Quality Value (dB) Qoffset _temp Offset temporarily applied to a cell as specified in [3] (dB) Q _rxlevmeas Cell Reception Level Measured Value (RSRP) Q _qualmeas Cell Quality Measured Value (RSRQ) Q _rxlevmin The minimum required reception level in a cell (dBm). If the UE supports the SUL frequency for this cell, Q _rxlevmin is obtained from q-RxLevMinSUL , if present, in SIB1, otherwise Q _rxlevmin is obtained from q-RxLevMin in SIB1. Q _qualmin Minimum required cell quality level (dB) Q _{rxlevminoffset} Offset to the signaled Q _rxlevmin taken into account when estimating Srxlev as a result of the periodic search for a higher priority PLMN during normal anchoring in the VPLMN [9] Q _{qualminoffset} Bias to the signaled Q _qualmin taken into account when estimating Squal as a result of the periodic search for a higher priority PLMN under normal anchoring in the VPLMN [9] P _compensation If the UE supports additionalPmax in NS-PinaxList, if any, in SIB1:
Max(P _EMAX1 - P _PowerClass , 0) - (min(P _EMAX2 , P _PowerClass ) - min(P _EMAXi , P _PowerClass )) (dB);
otherwise :
max(P _EMAXi - P _PowerClass , 0) (dB)

[132] In particular, in the case of cell reselection between RAT in favor of NR, Srxlev is used, and the value of Srxlev is compared with a specific ThreshX-high or ThreshX-low threshold.

[133] According to an embodiment, if a long term evolution (LTE) project base station provides a q-RxLevMinSUL value for a specific NR frequency via system information, and the terminal supports SUL when the terminal performs inter-RAT cell reselection in favor of an NR cell, belonging to the frequency NR, the terminal applies the value of q-RxLevMinSUL as the value of Q _rxlevmin for Srxlev, and thus outputs the value of Srxlev. The q-RxLevMinSUL value is provided for each NR frequency, and if the NR cells belonging to the particular NR frequency support SUL, the q-RxLevMinSUL value is provided for the particular NR frequency. For an NR frequency that does not support SUL, the q-RxLevMinSUL value is not provided. In the case of using RSRQ, the base station broadcasts Threshserving-lowQ, ThreshX-lowQ and ThreshX-highQ separately and provides them to the terminal. In the case of RSRP, Threshserving-lowP, ThreshX-lowP, and ThreshX-highP apply.

[134] FIG. 2E is a flowchart showing the operation of a terminal which is anchored in LTE to perform cell reselection to an NR cell according to Embodiment 2-1 of the invention.

[135] According to 2E, in operation 2e-15, the LTE base station 2e-10 determines whether there is an NR neighbor base station supporting SUL. If a neighbor base station NR supporting SUL exists, inter-RAT cell reselection may be required in favor of the neighbor base station NR. For this, the LTE base station 2e-10 includes, in SIB2N, which is one piece of system information, cell reselection parameter information necessary when performing inter-RAT cell reselection in favor of an SUL-supporting neighboring base station NR. If the neighbor base station NR supports SUL, in operation 2e-20, the necessary cell reselection parameter includes at least q-RxLevMinSUL. If the neighbor base station NR does not support SUL, the q-RxLevMinSUL value is not included in SIB2N. However, the q-RxLevMin value may be included in SIB2N for each NR frequency, whether or not the NR cells belonging to a particular NR frequency support the SUL function. The q-RxLevMinSUL value is provided for each NR frequency. SIB2N is system information that only a terminal supporting NR can understand, and mainly includes information about inter-RAT cell reselection in favor of NR. Therefore, a terminal that does not support NR does not need to receive SIB2N.

[136] In step 2e-25, if the terminal 2e-05, which is currently camped on one LTE cell, maintains a connection with the NR system, the terminal receives SIB2N, which broadcasts to the LTE base station. In operation 2e-30, if the terminal 2e-05 supports the SUL function, to output the Srxlev value at cell reselection, the terminal 2e-05 applies the q-RxLevMinSUL included in SIB2N as the value of Q _rxlevmin . If terminal 2e-05 does not support the SUL function, to output the Srxlev value at cell reselection, terminal 2e-05 applies q-RxLevMin included in SIB2N as the value of Q _rxlevmin .

[137] FIG. 2F is a flowchart showing the operation of a terminal that is anchored in LTE to perform cell reselection to an NR cell according to Embodiment 2-1 of the invention.

[138] Referring to FIG. 2F, in step 2f-05, if the terminal which is camped on the LTE base station supports NR, the terminal receives SIB2N from the LTE base station and stores the information included in SIB2N. SIB2N is mainly used to provide the parameters needed for cell reselection between RATs in favor of NRs.

[139] In operation 2f-07, the terminal initiates an inter-RAT cell reselection operation in favor of one NR cell belonging to a specific NR frequency.

[140] In step 2f-10, the terminal determines whether the terminal itself supports the SUL function. If the terminal itself supports the SUL function, the terminal proceeds to step 2f-15. If the terminal itself does not support the SUL function, the terminal proceeds to step 2f-25.

[141] In step 2f-15, the terminal determines whether the received SIB2N includes a q-RxLevMinSUL value corresponding to a specific NR frequency. The q-RxLevMinSUL value may be provided for each NR frequency, and if all NR cells belonging to a particular NR frequency support the SUL function, the q-RxLevMinSUL value for a particular NR frequency needs to be provided. If SIB2N includes the q-RxLevMinSUL value corresponding to the specific NR frequency, the terminal proceeds to step 2f-20. If SIB2N does not include the q-RxLevMinSUL value corresponding to the specific NR frequency, the terminal proceeds to step 2f-25.

[142] If the terminal supports the SUL function, and the q-RxLevMinSUL value corresponding to the specific NR frequency is provided in operation 2f-20, when reselecting a cell between RATs in favor of the specific NR frequency that supports SUL, the terminal applies the value of the received q-RxLevMinSUL as the value of Q _rxlevmin for Srxlev.

[143] If the terminal does not support the SUL function, or the q-RxLevMinSUL value corresponding to the specific NR frequency is not provided, in operation 2f-25, the terminal applies the value of the received q-RxLevMin as Q _rxlevmin for Srxlev.

[144] FIG. 2G is a flowchart showing the operation of a terminal that is anchored to an NR to perform cell reselection in favor of an NR neighbor cell according to Embodiment 2-2 of the invention.

[145] Referring to FIG. 2G, in operation 2g-15, the NR base station 2g-10, which is the neighboring SUL-supporting NR base station, includes in the SIBx, which is one piece of system information, cell reselection parameter information necessary when performing cell reselection in favor of NR cell belonging to the same or different frequency (intra-/inter-frequency cell reselection). As an example, parameters related to intra-frequency cell reselection are included in SIB2, and parameters related to inter-frequency cell reselection are included in SIB4. SIBx may belong to other system information (OSI). That is, the system information is periodically broadcast according to the determination made by the base station, or broadcast only within a predetermined period of time upon the request 2g-20 of the terminal. In operation 2g-25, if the neighbor base station NR supports SUL, SIBx may at least include q-RxLevMinSUL as a required cell reselection parameter. If the neighbor base station NR does not support SUL, SIBx does not include the q-RxLevMinSUL value. However, the q-RxLevMin value is included in the SIBx for each NR frequency, regardless of whether the NR cells belonging to a particular NR frequency support the SUL function. The q-RxLevMinSUL value is provided for each NR frequency. In operation 2g-30, if the terminal 2g-05, which is currently assigned to one NR cell, supports the SUL function, to output the Srxlev value at cell reselection, the terminal applies the q-RxLevMinSUL included in SIBx as the value of Q _rxlevmin . If the terminal 2g-05 does not support the SUL function, to output the Srxlev value at cell reselection, the terminal applies the q-RxLevMin included in SIBx as the value of Q _rxlevmin .

[146] FIG. 2H is a flowchart showing the operation of a terminal that is anchored on an NR to perform cell reselection in favor of an NR neighbor cell according to Embodiment 2-2 of the invention.

[147] Referring to FIG. 2H, in step 2h-05, if no valid SIBx is stored in the terminal, the terminal requests system information from the current serving base station NR.

[148] In step 2h-10, the terminal stores the SIBx received from the serving base station.

[149] In step 2h-13, the terminal initiates an intra-/inter-frequency cell reselection operation in favor of one NR cell belonging to a specific NR frequency.

[150] In step 2h-15, the terminal determines whether the terminal itself supports the SUL function. If the terminal itself supports the SUL function, the terminal proceeds to step 2h-20. If the terminal itself does not support the SUL function, the terminal proceeds to step 2h-30.

[151] In step 2h-20, the terminal determines whether the received SIBx includes a q-RxLevMinSUL value corresponding to a particular NR frequency. The q-RxLevMinSUL value may be provided for each NR frequency, and if all NR cells belonging to a particular NR frequency support the SUL function, the q-RxLevMinSUL value for a particular NR frequency needs to be provided. If the received SIBx includes the q-RxLevMinSUL value corresponding to the specific NR frequency, the terminal proceeds to step 2h-25. If the received SIBx does not include the q-RxLevMinSUL value corresponding to the specific NR frequency, the terminal proceeds to step 2h-30.

[152] If the terminal supports the SUL function, and the q-RxLevMinSUL value corresponding to the specific NR frequency is provided in operation 2h-25, when intra-/inter-frequency cell selection is reselected in favor of the specific frequency that supports SUL, the terminal applies the value of the received q- RxLevMinSUL as Q value _rxlevmin for Srxlev.

[153] If the terminal does not support the SUL function, or the q-RxLevMinSUL value corresponding to the specific NR frequency is not provided, in operation 2h-30, the terminal applies the value of the received q-RxLevMin as the value of Q _rxlevmin for Srxlev.

[154] FIG. 2I is a block diagram showing a configuration of a terminal according to an embodiment of the invention.

[155] Referring to FIG. 2I, the terminal includes a radio frequency (RF) processor 2i-10, a low frequency processor 2i-20, a storage unit 2i-30, and a controller 2i-40. The controller 2i-40 may further include a multi-system processor 2i-42.

[156] The RF processor 2i-10 is used to transmit or receive a signal over a wireless channel, such as band conversion and signal amplification. That is, the RF processor 2i-10 upconverts the low frequency signal provided by the low frequency processor 2i-20 into a band RF signal, and then transmits the RF band signal through the antenna and downconverts the RF band signal received through the antenna into a low frequency signal. For example, the RF processor 2i-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), and the like. In FIG. 2I shows only one antenna, but the terminal may be provided with multiple antennas. In addition, the RF processor 2i-10 may include multiple RF circuits. Additionally, the RF processor 2i-10 may perform beamforming. For RF beamforming, processor 2i-10 may adjust the phase and amplitude of each of the signals transmitted or received through multiple antennas or antenna elements. Additionally, the RF processor 2i-10 can perform MIMO and can receive multiple layers during a multi-input, multiple-output (MIMO) operation.

[157] The low frequency processor 2i-20 performs a conversion function between the low frequency signal and the bit stream according to the system physical layer standard. For example, when transmitting data, the low frequency processor 2i-20 generates complex symbols by encoding and modulating the transmitted bit stream. Additionally, upon receiving data, the low frequency processor 2i-20 reconstructs the received bitstream by demodulating and decoding the low frequency signal provided by the RF processor 2i-10. For example, according to the OFDM scheme, when transmitting data, the low frequency processor 2i-20 generates complex symbols by encoding and modulating the transmitted bitstream, maps the complex symbols into subcarriers, and then performs an inverse fast Fourier transform (IFFT) operation and cyclic prefix (CP) insertion for configuring OFDM symbols. Further, when receiving data, the low frequency processor 2i-20 divides the low frequency signal provided by the RF processor 2i-10 into blocks of OFDM symbols, reconstructs the signals mapped to subcarriers by a fast Fourier transform (FFT) operation, and then reconstructs the received bitstream by demodulating and decoding.

[158] The low frequency processor 2i-20 and the RF processor 2i-10 transmit and receive the signal as described above. Therefore, the low frequency processor 2i-20 and the RF processor 2i-10 may be referred to as a "transmitter", "receiver", "transceiver", or "communication unit". Also, at least one of the low frequency processor 2i-20 and the RF processor 2i-10 may include multiple communication modules to support multiple different radio access technologies. Additionally, at least one of the low frequency processor 2i-20 and the RF processor 2i-10 may include different communication modules for signal processing in different frequency bands. For example, different radio access technologies may include wireless LAN (eg, IEEE 802.11), cellular network (eg, LTE), etc. and millimeter (e.g. 60 GHz) band.

[159] The storage unit 2i-30 stores data such as base programs, application programs, and configuration information for operating the terminal. In particular, the storage unit 2i-30 may store information related to a second access node capable of wireless communication using the second radio access technology. Also, the storage unit 2i-30 provides stored data upon request of the controller 2i-40.

[160] The controller 2i-40 controls the operation of the terminal as a whole. For example, the controller 2i-40 transmits or receives a signal through the low frequency processor 2i-20 and the RF processor 2i-10. Additionally, the controller 2i-40 writes data to and reads data from the storage unit 2i-30. To do this, the controller 2i-40 may include at least one processor. For example, the controller 2i-40 may include a communication processor (CP) configured to perform communication control and an application processor (AP) configured to control a higher layer, such as an application program layer.

[161] In addition, the controller 2i-40 may be configured to: receive system information related to cell reselection for a neighbor cell from a base station to which the terminal camps; if the terminal supports SUL, and the minimum requirement first reception level information related to SUL is provided by the system information, obtain the first reception level value in cell selection based on the first minimum requirement reception level information related to SUL; and perform cell reselection to the NR cell based on the first reception level value of the cell selection. Further, the controller 2i-40 may be configured to: if the terminal does not support SUL, obtain a second receive level value in cell selection based on the second minimum requirement receive level information from the system information; and perform cell reselection based on the second reception level value in the cell selection. If the base station is an LTE base station, the system information may be related to inter-RAT cell reselection, and the minimum requirement first receiving layer information related to SUL may be used for inter-RAT cell reselection in favor of an NR cell. If the base station is an NR base station, and the neighbor cell is related to intra-frequency cell reselection, the system information including the minimum requirement first reception layer information related to SUL may correspond to a system information block (SIB) 2 (SIB 2). If the base station is an NR base station and the neighbor cell is related to inter-frequency cell reselection, the system information including the first minimum requirement reception level information related to SUL may conform to SIB 4. The system information may include the minimum requirement reception level information for each neighbor cell supporting SUL.

[162] FIG. 2J is a block diagram showing a configuration of a base station according to an embodiment of the invention.

[163] Referring to FIG. 2J, the base station includes an RF processor 2j-10, a low frequency processor 2j-20, a backhaul communication unit 2j-30, a storage unit 2j-40, and a controller 2j-50. The controller 2j-50 may further include a multi-system processor 2j-52.

[164] The RF processor 2j-10 is used to transmit or receive a signal over a wireless channel, such as band conversion and signal amplification. That is, the RF processor 2j-10 upconverts the low frequency signal provided by the low frequency processor 2j-20 into a band RF signal, and then transmits the RF band signal through the antenna and downconverts the RF band signal received through the antenna into a low frequency signal. For example, the RF processor 2j-10 may include a transmit filter, a receive filter, an amplifier, a mixer, an oscillator, a DAC, an ADC, and the like. In FIG. 2J shows only one antenna, but the first access node may be provided with multiple antennas. In addition, the RF processor 2j-10 may include multiple RF circuits. Additionally, the RF processor 2j-10 may perform beamforming. To generate RF beams, processor 2j-10 may adjust the phase and amplitude of each of the signals transmitted or received through multiple antennas or antenna elements. RF processor 2j-10 may be configured to transmit one or more layers for downlink MIMO operation.

[165] The low frequency processor 2j-20 performs a conversion function between the low frequency signal and the bit stream according to the physical layer standard of the first radio access technology. For example, when transmitting data, the low frequency processor 2j-20 generates complex symbols by encoding and modulating the transmitted bitstream. Additionally, upon receiving data, the low frequency processor 2j-20 reconstructs the received bitstream by demodulating and decoding the low frequency signal provided by the RF processor 2j-10. For example, according to the OFDM scheme, when transmitting data, the low frequency processor 2j-20 generates complex symbols by encoding and modulating the transmitted bitstream, maps the complex symbols to subcarriers, and then performs an IFFT operation and insertion of a CP to configure OFDM symbols. Further, when receiving data, the low frequency processor 2j-20 divides the low frequency signal provided by the RF processor 2j-10 into blocks of OFDM symbols, reconstructs the signals mapped to subcarriers by a fast Fourier transform (FFT) operation, and then reconstructs the received bitstream by demodulating and decoding. The low frequency processor 2j-20 and the RF processor 2j-10 transmit and receive signals as described above. Accordingly, the low frequency processor 2j-20 and the RF processor 2j-10 may be referred to as a "transmitter", "receiver", "transceiver", "communication unit", or "wireless communication unit".

[166] The transit network communication unit 2j-30 provides an interface for communicating with other nodes in the network. Thus, the backhaul communication unit 2j-30 converts the bitstream to be transmitted from the primary base station to another node, such as the auxiliary base station and the core network, into a physical signal, and converts the physical signal received from the other node into a bitstream.

[167] The storage unit 2j-40 stores data such as basic programs, application programs, and configuration information for operating the primary base station. In particular, the storage unit 2j-40 may store information about the bearers allocated to the available terminals, measurement results reported by the available terminals, etc. Also, the storage unit 2j-40 may store information that becomes a standard for determining whether to provide or stop providing the terminal with the possibility of multi-system communication. Additionally, the storage unit 2j-40 provides the stored data upon request of the controller 2j-50.

[168] The controller 2j-50 controls the overall operation of the primary base station. For example, the controller 2j-50 transmits or receives a signal through the low frequency processor 2j-20 and RF processor 2j-10, or through the transit network communication unit 2j-30. Additionally, the controller 2j-50 writes data to and reads data from the storage unit 2j-40. To do this, the controller 2j-50 may include at least one processor.

[169] The controller 2j-50 may be configured to: identify an NR neighbor cell supporting SUL; generate system information related to cell reselection in favor of an NR neighbor cell supporting SUL; and transmit system information. If the terminal receiving the system information supports SUL, the first reception level value of the cell selection can be obtained from the first reception level information of the minimum requirement related to SUL included in the system information, and cell reselection can be performed based on the first reception level value of the cell selection. honeycombs. If the terminal does not support SUL, the second cell selection receive level value can be obtained based on the minimum requirement second receive level information from the system information, and cell reselection can be performed based on the second cell selection receive level value. If the base station is an LTE base station, the system information may be related to inter-RAT cell reselection, and the minimum requirement first receiving layer information related to SUL may be used for inter-RAT cell reselection in favor of an NR cell. If the base station is an NR base station, and the neighbor cell is related to intra-frequency cell reselection, the system information including the minimum requirement first reception level information related to SUL may correspond to SIB 2. If the base station is an NR base station, and the neighbor cell refers to inter-frequency cell reselection, system information including first minimum requirement reception level information related to SUL may conform to SIB 4. The system information may include minimum requirement reception level information for each neighbor cell supporting SUL.

[170] The embodiments shown and described in the description of the invention and the accompanying drawings are provided only to simplify the description of the scope of the invention and help in understanding the invention, and are not intended to limit the scope of the invention. Therefore, it should be understood that, in addition to the embodiments disclosed here, all modifications and changes or modified and changed forms based on the technical idea of the invention are within the scope of the invention.

[171] While the invention has been shown and described with reference to various embodiments thereof, those skilled in the art will appreciate that various changes in form and detail may be made without departing from the spirit and scope of the invention as defined by the following claims and its equivalents.

Claims (67)

1. A method performed by a terminal in a communication system, the method comprising: transmitting to the base station a system information request message related to cell reselection for a new radio (NR) neighbor cell; receiving, from the base station, system information related to cell reselection for the NR neighbor cell, the system information including information about the second minimum required reception level of the NR neighbor cell; in the case where the terminal supports Supplementary Uplink (SUL), and the system information includes information about the first minimum required reception level for the SUL of the neighboring cell NR, reselecting a cell using a first cell selection reception level value identified based on the first minimum required reception level information; and in the case where the terminal does not support SUL, cell reselection is performed using the second cell selection reception level value identified based on the second minimum required reception level information. 2. The method according to p. 1, containing the steps in which: in the case where the terminal supports SUL and the system information does not include the first minimum required reception level information for the SUL of the neighboring cell NR, perform cell reselection using the second reception level value in cell selection identified based on the second minimum required level information reception. 3. The method according to p. 1, in which, in the case where the base station corresponds to the base station of the Long Term Evolution (LTE) project, the system information relates to cell reselection between radio access technologies (inter-RAT), and wherein the first minimum required reception level information related to the SUL is used for inter-RAT cell reselection in favor of the NR cell. 4. The method according to claim 1, in which: in the case where the base station corresponds to the NR base station, and the NR neighbor cell refers to intra-frequency cell reselection, the system information corresponds to a system information block 2 (SIB 2); in the case where the base station corresponds to the NR base station and the NR neighbor cell refers to inter-frequency cell reselection, the system information corresponds to SIB 4; the system information contains a plurality of information elements about the first minimum required reception level for the SUL of each NR neighbor cell in case each NR neighbor cell supports SUL; and a plurality of information elements about the second minimum required reception level for each NR neighbor cell, regardless of whether each NR neighbor cell supports SUL. 5. A terminal in a communication system, wherein the terminal comprises transceiver; and controller configured to: transmitting to the base station, via the transceiver, a system information request message related to cell reselection for a new radio (NR) neighbor cell; receive, from the base station, system information related to cell reselection for the NR neighbor cell, the system information including information about the second minimum required reception level of the NR neighbor cell, in the case where the terminal supports Supplementary Uplink (SUL), and the system information includes information about the first minimum required reception level for the SUL of the neighboring cell NR, perform cell reselection using the first cell selection reception level value identified based on the first minimum required reception level information; and in the case where the terminal does not support SUL, perform cell reselection using the second cell selection reception level value identified based on the second minimum required reception level information. 6. The terminal according to claim 5, in which the controller is configured to: in the case where the terminal supports SUL and the system information does not include the first minimum required reception level information for the SUL of the neighbor cell NR, perform cell reselection using the second reception level value in cell selection identified based on the second minimum required level information reception. 7. Terminal according to item 5, in which, in the case where the base station corresponds to the base station of the Long Term Evolution (LTE) project, the system information relates to cell reselection between radio access technologies (inter-RAT), and wherein the first minimum required reception level information related to the SUL is used for inter-RAT cell reselection in favor of the NR cell. 8. Terminal according to claim 5, in which: in the case where the base station corresponds to the NR base station, and the NR neighbor cell refers to intra-frequency cell reselection, the system information corresponds to a system information block 2 (SIB 2); in the case where the base station corresponds to the NR base station and the NR neighbor cell refers to inter-frequency cell reselection, the system information corresponds to SIB 4; the system information contains a plurality of information elements about the first minimum required reception level for the SUL of each NR neighbor cell in case each NR neighbor cell supports SUL; and a plurality of information elements about the second minimum required reception level for each NR neighbor cell, regardless of whether each neighbor cell supports SUL. 9. A method performed by a base station in a communication system, the method comprising: receiving from the terminal a system information request message related to cell reselection for a new radio (NR) neighbor cell; generating system information related to cell reselection for the NR neighbor cell, the system information including information about a second minimum required reception level of the NR neighbor cell; and transmitting system information related to cell reselection for the NR neighbor cell, wherein, in case the system information includes the first minimum required reception level information for the Supplementary Uplink (SUL) of the NR neighbor cell, the first minimum required reception level information is used for the first reception level value when selecting a cell for the terminal, supporting SUL, and wherein the second minimum required reception level information is used for the second reception level value when selecting a cell for a terminal not supporting SUL. 10. The method according to p. 9, in the case where the system information does not include the first minimum required reception level information for SUL of the neighbor cell NR, the second minimum required reception level information is used for the second reception level value when selecting a cell for a non-SUL capable terminal. 11. The method according to p. 9, in which, in the case where the base station corresponds to the base station of the Long Term Evolution (LTE) project, the system information relates to cell reselection between radio access technologies (inter-RAT), and wherein the first minimum required reception level information relating to the SUL is used for inter-RAT cell reselection in favor of the NR cell. 12. The method according to claim 7, in which: in the case where the base station corresponds to the NR base station and the NR neighbor cell is related to intra-frequency cell reselection, the system information corresponds to a system information block 2 (SIB 2); in the case where the base station corresponds to the NR base station and the NR neighbor cell refers to inter-frequency cell reselection, the system information corresponds to SIB 4; the system information contains a plurality of information elements about the first minimum required reception level for the SUL of each NR neighbor cell in case each NR neighbor cell supports SUL; and a plurality of information elements about the second minimum required reception level for each NR neighbor cell, regardless of whether each neighbor cell supports SUL. 13. A base station in a communication system, the base station comprising: transceiver; and controller configured to: receive from the terminal via the transceiver a system information request message related to cell reselection for a new radio (NR) neighbor cell; generating system information related to cell reselection for the NR neighbor cell, the system information including information about the second minimum required reception level of the NR neighbor cell, and transmit system information related to cell reselection for an NR neighbor cell, wherein, in case the system information includes the first minimum required reception level information for the Supplementary Uplink (SUL) of the NR neighbor cell, the first minimum required reception level information is used for the first reception level value when selecting a cell for the terminal, supporting SUL, and wherein the second minimum required reception level information is used for the second reception level value when selecting a cell for a terminal not supporting SUL. 14. Base station according to claim 13, in the case where the system information does not include the first minimum required reception level information for SUL of the neighbor cell NR, the second minimum required reception level information is used for the second reception level value when selecting a cell for a non-SUL capable terminal. 15. Base station according to claim 13, in which, in the case where the base station corresponds to the base station of the Long Term Evolution (LTE) project, the system information relates to cell reselection between radio access technologies (inter-RAT), wherein the SUL-related first minimum required reception level information is used for inter-RAT cell reselection in favor of the NR cell, and wherein, in the case where the base station corresponds to the base station NR, and the neighbor cell NR refers to intra-frequency cell reselection, the system information corresponds to system information block 2 (SIB 2), in the case where the base station corresponds to the NR base station, and the NR neighbor cell refers to inter-frequency cell reselection, the system information corresponds to SIB 4, wherein the system information contains a plurality of information elements about the first minimum required reception level for the SUL of each NR neighbor cell in case each NR neighbor cell supports SUL; and wherein a plurality of information elements about the second minimum required reception level for each NR neighbor cell, regardless of whether each neighbor cell supports SUL.

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